To update Java on your system, open a browser and visit the Java updating website. 5. Press Ctrl + Shift + Esc together to open the Task Manager. 16. 18. What are the best JVM arguments for a 4GB laptop that can let me run a. Step 1: Go to Settings, Java, and click on the three dots next to Java path. ago. If not, use the same approach as for 1. It will enable garbage collector that prevents decreasing performance over time while playing. PolyMC is currently the best mod manager I'm aware of, although it takes a bit more learning to use well than the big corporate ones from twitch/curseforge. These flags work and scale accordingly to any size of memory, even 500MB but 1. 1 Forge version and performance/graphic change mods - Forge 1. Vanilla Minecraft and Minecraft server software in version 1. There's really no reason to have them different if you're using. Turn down. 12. "2G" represents how much RAM is allocated to the client. jar --nogui. Tuning the JVM – G1GC Garbage Collector Flags for Minecraft. You could try using java 14. This is to be expected as the game and mod (pack)s continue to evolve so quickly. I found that -XX. Click either Home (Windows) or File (Mac), then either click New item (Windows) or select New (Mac) and click Text Document. You should also tweak your java arguments: -XX:+UseShenandoahGC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX. This thread is archived. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. 6, and as always with Java arguments, the chance of making things worse is much higher than making things better if you just set things without fully understanding. server. Open your server. Modding Your Minecraft World with Java Arguments. Put the mods folder in: ~/Library/Application Support/minecraft. I have magnesium, clumps, ai improvement mods, allocated an adequate amount of ram, prioritized java's CPU usage, closed everything other than Minecraft, ran antiviruses and is still have some lag spikes. Step 2: Open your Minecraft launcher, select the version you wish to apply the argument to, and click edit profile. You can run command "/forge tps" to see, how well Minecraft is running currently, you should have 20 TPS for it to run smoothly. 11. gcInterval=2147483646 -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. 16. Java arguments are settings that you can change in Minecraft to enhance its performance or graphics. I'm hoping to get around 6-8 gigabytes of ram for about $40. The memory cleaning process also starts when your RAM usage goes above a certain percent. 17+ on a Minecraft server SummaryForge is a modding API for Minecraft that allows users to create and install mods to add. - Memory : 16 Go - Java : Version 17. What arguments should I use to make my server more stable, and what arguments should I tell my friends to use when they play on it. Issues with the Minecraft Launcher file path can cause the "exit code: 1" on Windows. Reports have been mixed on the upgrade, some people report next to no change in performance, whereas others like myself have doubled their frame rate from both updating to Java 8 and using the tweaked command line arguments we derived. Set the version under: Configuration → Server Settings → Forge Version. Enter -Xmx6G if you want to specify an average of 6 GB of RAM to your game. 139. 6. This can be resolved by: Looking at your FTB launcher and finding the version of Forge that the modpack runs on. If you go that, make sure to set your "Java Executable" in the launcher to the non-native javaw. dgc. Locate "JVM ARGUMENTS" and find "-Xmx2G". We would suggest to set a fixed heap size, something like -Xms4096M -Xmx4096M (or 1G or 2G). (161 is the latest) 4. Great now we have all the places to find your ram! Remember that number. 18. Modded Minecraft (and all java Minecraft) is very unoptimized. Add this to Additional Arguments. Open your terminal, navigate to the saved location, and then run java -Xms2G -Xmx2G -jar paper. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. 18 forge 2022>REM Add custom program arguments {such as nogui} to this file in the next line. JVM Arguments for Modded Minecraft (Updated 12/30/13) Thread starter Eyamaz; Start date Aug 13, 2013; Forums. jar nogui -XX. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. every version should use these arguments, you can find an explanation of them on some old post. So, to make things easier for anyone in the future wanting to find a good combo of mods and the right java arguments to use with them, this post will act as a more compact list of things you'll need to do so you don't have to search for three or more weeks for the right answers like I had. You can affirm in F3 how much is allocated and how much is being used. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. The correct part of code will be: . Otherwise, I have a feeling it might start assuming things about your PC and experience and get you a potentially faulty answer based on false assumptions. 5. We have a few recommended Java arguments for specific packs, however, they should work for any pack in general. Default Minecraft Launcher. The Z Garbage Collector is enabled with the command-line option -XX:+UseZGC. For example;How can you add more RAM to Minecraft in 2023? Well, in this video, we show you exactly how to allocate more RAM to Minecraft, how much RAM you need to give. Done! In Minecraft Launcher, click Installation. Does Fabric somehow do things differently to not need them, or is. Content mods that add machines, worlds, monsters, etc, will take more than a mod that blurs your inventory screen for some reason. 18 Forge world. This will add an extra 2 gigs of RAM for java to use for minecraft. Extra arguments. For a longer, and more technical read on Java launch arguments, we recommend studying Aikar's Garbage Collection guide, which applies to Forge, Sponge and Spigot environments alike. gcInterval=2147483646 -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=51 -XX:G1HeapRegionSize=32M. You can use either megabyte or gigabyte designations like 1024M or 1G with the flags. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all. 0. 16. Supposedly keeps CPU usage stable. jar. Right-click on the “minecraft. 13+ minecraft just needs 4gb for vanilla itself to run fine. Everybody knows we need to use this one: -Xmx4G But these ones comes by defaut in the Minecraft Launcher: -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M Are they good. 7. With over 800 million mods downloaded every month and over 11 million active monthly users, we are a growing community of avid gamers, always on the hunt for the next thing in user-generated content. Running the new default arguments I noticed that the performance is much worse, especially when allocating 4 GB of memory. Some of the 1. Adding custom Java arguments; Debugging issues with the launcher. 6. -d64. Click on Browse and pick the SevTech+Ages-3. 8+) Update. But like I said, it happens that minecraft mostly only uses the memory you. Killing Minecraft easily if it crashes or freezes. For the server, I have an i7-2600 @ 3. Use a text editor to open the run. Java arguments. 8. First of all check for spelling mistakes. With snapshot 21w19a Mojang just switched to Java 16. 20. Every modpack is effectively a different application in terms of performance tuning, which means that the startup parameters for vanilla may not work. Since then, I've just kept those arguments in place, even when playing. Updated 12/30/13. One more thing to recommend in the world of Java arguments: switching to the Zulu OpenJDK, without any tinkering or command-line argument stuff other than the heap memory limit, has given me way more. I have found very brief and limited descriptions on how to use argument types and even looked at the vanilla commands. #1. jar nogui. integer (1, 10)) . 5 mods are compatible with Java 17. I'm using a 3 year old laptop with a i5-2450M 2. C:UsersUserDesktop1. i think i fixed. 2 to improve ram management and avoid freezes and more? -XX:+UseG1GC -Dsun. 9. 6. ”. First things first, you'll need to open up your Mac. Means: Change "-Xms2G" to "-Xms7G" in the JVM arguments section of the launcher profile. After a few research i finnaly found an java argument line that should work good to everyone, for me in enigmatica 2 expert doubled the frames, reduced processor usage by 50%, ram usage is at 4-5 Gb insted of 8-9, and lag spikes are drastically reduced ( 1 in 3 hours of gameplay) . 18. 16. server. Your 2 GB are for sure not enough. 18. Fix 2: Set Java as a priority. Set your java arguments to this. Connect and share knowledge within a single location that is structured and easy to search. How to install the MultiMC Launcher with modpacks Summary The MultiMC Launcher is a versatile and user-friendly tool designed for managing and. 32 render distance is 4,225. The gencon policy is enabled with the command-line option. Java 1. Adjust the JVM arguments as desired, click save, then close the Minecraft Launcher. 2>REM Add custom JVM arguments to the user_jvm_args. 8. This is where you will paste the above arguments. 0. Click on "More options" on the bottom. With 32bit java, the maximum is around 1500MB. At the bottom of the settings page there is a box for "Additional Arguments". ”. Alternative JVM implementations such as OpenJ9 or GraalVM can work. The following are general arguments that the community recommends: -XX. elitedashone. preferIPv4Stack=true. Posted April 6, 2018. Personally, I've found that it still gives me some stuttering though. Due to the fact that explicit gc can freeze your game for a short period, the mod watches the player movement and starts to clean up your RAM after the player stays idle for a while. 8). If you’re playing on 1. 3. With over 800 million mods downloaded every month and over 11 million active monthly users, we are a growing community of avid gamers, always on the hunt for the next thing in user-generated content. exe). Garbage collection is the technical term referring to the cleaning of unused items that are in the allocated RAM to free them up for other uses. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. Add a Comment. Showing Minecraft’s console output in a color coded window. The following snippet is an example of the JVM flags that are displayed in a crash report when the global Java limit problem occurs. As for which pack, for someone who hasn't played java edition before, you can just read the descriptions of a few of the top packs and see what sounds good. Now, you’ll see two fields called “Java executable” and “JVM arguments. I also made sure it had enough RAM. All objects are initially allocated into the nursery. Posted March 27, 2020. Hello, i wanted to ask for a effective argument line for my launher. 0. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion. Whatever you decide to use as the argument parameters for your Minecraft instance, I would be sure to double check two things: The Twitch settings, in the Minecraft tab, check that the Java Settings slider is set to what you are wanting to use, and then click "Done" at the bottom of the Twitch Settings window. 3G is plenty even if you have a ton of mods. ago. Path=detect Java. For systems with +16GB RAM (8GB ASSIGNED of total): Picking a Java Runtime. jar. 0-openjdk-1. 18. Minecraft is one such game that is highly based on Java. Go to the "Installations" tab. But after I close the launcher and open it again, this. Open Minecraft’s Advanced Options and perform a repair in the Settings app. My startup script looks something like this: screen -dmS minecraft java -Xmn2048m -Xmx6G -XX:GCTimeRatio=2 -XX:ParallelGCThreads=4 -XX:+UseParNewGC -XX:MaxGCPauseMillis=2000 -XX:MaxPermSize=128m -XX:+DisableExplicitGC -jar spigot-1. CTRL + Comma will direct you to the Settings menu from inside the launcher. Hey, I just reinstalled Minecraft and wanted to add my favourite texture pack. getSource (), IntegerArgumentType. -Xms1G will set the MINIMUM HEAP to 1GB at start-up. I tried everything other than this. Generally, when I need more memory for Minecraft, I set the max heap and not the min heap. Also important: JVM arguments are case-sensitive; Try to install the non-native version of Java (the download can be found here). You might need to increase it if you are running modded or with a huge view distance. changing configs on the CF settings will only change the -Xmx argument. -XX:+UnlockExperimentalVMOptions -XX:+UseZGC. 7. GC=default Java. 10 java arguments for modded pack. gc () to free up your memory. Open the Minecraft tab. 5 MDK, some of the code in the. If you're running a server or a single player world with some lag problems and you try it out let me know if it works for you! If you're interested in why using Graal is faster I can. ADDITIONALLY Java arguments really should be custom tailored to the machine. The exception is a few Just Enough _____ mods for different mod packs. Make sure you have enough memory remaining outside java heap. if you're struggling with. So, to make things easier for anyone in the future wanting to find a good combo of mods and the right java arguments to use with them, this post will act as a more compact list of things you'll need to do so you don't have to search for three or more weeks for the right answers like I had. Now for windows 8 go to start and type in settings and then click pc and devices, then pc info and it should show the ram. The easiest solution is just drop your java arguments in the launcher. #13 Jul 21, 2022. You should be able to set java arguments and ram allocation in the CFA settings. 13 multithreaded world generation, 1. 18. Just double click it like any application and it'll open a black command prompt and start setting of the server and generating the world. java -Xms10G -Xmx10G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 . I can't see where I need to add more ram to the argument. The server will lag heavily while the process is running, but once it is done your performance will improve dramatically. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. Figured out a solution to this bug. C:UsersUserDesktop1. # OptiFine. The Mod works. 4. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. If your MC is taking 15-20 minutes to load, and is thrashing 100% CPU, you are very likely a victim of this issue. func_72963_a(WorldServer. The /r/feedthebeast subreddit is not affiliated or associated with the Feed. Even 50 ms is really too long given that at 60 FPS a frame is 16. The Java Argument Generator is a simple, easy to use program intended to generate an argument made to speed up Minecraft. curseforge -> settings -> minecraft -> scroll down -> allocated memory. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. Use these flags exactly, only changing Xmx and Xms. jar. Thank you for your help. Reposting my posts I have in the Paper & Spigot community here! EDIT: Please see for updated content. To make Minecraft use alternative JRE's, simply point the launcher to the Java executable through the menu right above JVM arguments. Reset all network settings. C:UsersUserDesktop1. I found that -XX. Well, I eventually ended up finding a solution. I put them on my server and it seems to work. mixins. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. Fabric Java Args? Hey all, I am looking at switching the server I run for my friends and I from spigot to fabric, and have seen no mention of Java Args with the fabric-server-launch. Check your JVM arguments, or remove any resource packs installed for this. Players know Optifine as the most popular graphics performance mod for Minecraft 1. The JDK comes with extra tools like the javac compiler, so it's a bigger install. Special thanks to Keybounce for his research and ideas. Souls - After you die, a hostile Soul that stores your inventory will spawn. I've been dying to play Java and modded minecraft. minecraft. In the “Target” field, add “-Xmx2G” to the end of the line. The flag Xmx specifies the maximum memory allocation pool for a Java virtual machine (JVM), while Xms specifies the initial memory allocation pool. 9. 1, if possible. MultiMC Modpack Install. Picking a Java Runtime . Don't set it too high. 6, close to the same mapped area as the 1. Forge integration (automatic installation, version downloads, mod management). It just forces the GC to run harder and lag the main java thread. However, with 21w19a, Minecraft uses Java 16 now, so these JVM arguments do not work. 8. I'm curious as to what JVM arguments people are using to launch their servers. Open the Launcher and verify you’re on the Java Edition section of the launcher. Turns out, since most Minecraft server java arguments mods are made by hobbyists and not experienced coders, there are some bad programming habits that are common to them, and one of those appears to be calling explicit garbage collection, way too frequently, eating massive amounts of CPU time. They are common to all JVM garbage collectors. These are the amount of on-heap memory that will be used by Minecraft, which includes the world, integrated server, and anything that Minecraft needs to run. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. JVM Arguments. - Memory : 16 Go - Java : Version 17. In windows your Redhat Java will be somewhere like "C:Program FilesRedHatjava-1. -d64. , how much memory will initially be used when launching. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. x. 0. This mod adds a hidden video setting that players can adjust and also render fundamental chunks of the game. Does anyone know some good java arguments i could try? -XX:+UseG1GC -XX:+UnlockExperimentalVMOptions -XX:G1NewSizePercent=20 . I was able to prevent this with some tweaking. Click on the version menu and find quilt (You could optionally edit the quilt one) Set the directory for the game (Leave it if you just want to keep it in . 5 GHz processor. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. Well, I eventually ended up finding a solution. Welcome to the Vault Hunters Minecraft subreddit! Here we discuss, share fan art, and everything related to the popular video game. Once you're on the Java website, look for and click the "Agree and start free. Experiment with different settings and consult resources for specific. Learn How. Change any other settings you need to while you're at it. Creates particles. 0. The Java Executable option can be used to change the Java version that Minecraft uses. But, it is recommended that the heavier mod packs like Monster and DW20 use 64 bit due to the increased memory usage required. From mods like OptiFine and Sodium to more complex stuff like JVM arguments, we'll cover all of them here. Mod developers often make improvements to their mods, including memory optimizations, which can positively impact RAM usage in your modded Minecraft setup. Allocating More RAM Using Legacy FeedTheBeast (FTB) Launcher. Enigmatica modpacks include the performance mods that we consider to be stable enough for most users. 12?. :P; 7. Step 5: JVM Arguments. In addition to turning off MipMap, biome blending, using good Java arguments, and all the traditionally recommended solutions, I currently recommend the following serverside mods, if your server is seperate. 8+) Update. So I'd apreciate some help ! Specs Step 1: Launch Java Argument Generator. 3. Thousands of components will flow into and through the ever-growing sequence of your machines, providing the means to explore the next level of technology. txtMinecraft Launcher. (161 is the latest) 4. minecraft. GPU is more or less irrelevant depending on graphical settings of course. 2 until Minecraft 1. . Haven't tested this. We would like to show you a description here but the site won’t allow us. ADDITIONALLY Java arguments really should be custom tailored to the machine. Hover over the. 5. Conclusion. If so, edit the Java executable path in Minecraft’s settings with these steps. 7. For a more comprehensive reading, or if you are playing Minecraft Bedrock. I'm trying to install some fabric mods on. For Minecraft 1. The Java Argument Generator is a simple, easy to use program intended to generate an argument made to speed up Minecraft. 8. rmi. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. What this does is free up unused memory periodically while java is running, aka cleans up the garbage. I have magnesium, clumps, ai improvement mods, allocated an adequate amount of ram, prioritized java's CPU usage, closed everything other than Minecraft, ran antiviruses and is still have some lag spikes. 6. Minecraft's system of loading objects into memory doesn't quite work as. Constant CPU spikes to 100% in any mod packs making them unplayable. 16. jar nogui. Arguments. Minecraft 1. From the info given, it sounds like it should run then. The Z Garbage Collector is enabled with the command-line option -XX:+UseZGC. 20. 14. I works perfectly fine with a small number of mods but with as many as I have, it seems to cause a Java crash, not a Minecraft crash. jar. Here is how you allocate RAM on a windows system: Create a new document and save it as run. Update the Java Version . We have a few recommended Java arguments for specific packs, however, they should work for any pack in general. If you simply want to add custom advancements, functions, loot tables, structures, recipes or tags to your game, look into how to make a Data pack, which does not require programming. bat". The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. To fix the Minecraft low FPS on a high-end PC you should also make sure that your graphics drivers aren’t outdated or corrupted. Archived post. 15 (Java 8+, MC 1. Press edit minecraft. With over 800 million mods downloaded every month and over 11 million active monthly users, we are a growing community of avid gamers, always on the hunt for the next thing in user-generated content. jar and copy the text in the text box. I get the following crash report:To enhance FPS in Minecraft 1. As such, adding the -XX:+DisableExplicitGC flag to the java arguments helps a lot, and then various other tweaks to the automatic garbage collector, found on this blog post from someone who knows much more about what they're doing than I do, dropped CPU usage from constantly 60% to as low as 1% when no one's online, and tick time is now fairly. 12. 5 and up, use Java 17. At a rough estimate:Parameters 18-19, mod. Attention! This flag can cause "Out of memory" errors! Arguments that are highly recommended to be included in the startup list:-mx1G Dynamic memory allocation. 18. In heavy modpacks (250+ mods) it's stutter, the game freezes, the game use the max ram. . The executable is located in /bin. ShadersMod and OpenGL requires a lot of memory outside java heap. To be honest I don't even know what those are, I use a buckit server with a few plugins and a few mods. exe (e. X, but Minecraft 1. Overview. exe [arguments to java. json does not specify "minVersion" propertyATLauncher is a simple and easy to use Minecraft Launcher which contains 155 modpacks for you to choose from, as well as the ability to browse and install packs from other platforms including CurseForge, Modrinth and Technic. The subreddit for all things related to Modded Minecraft for Minecraft Java Edition --- This subreddit was originally created for discussion around the FTB launcher and its modpacks but has since grown to encompass all aspects of modding the Java edition of Minecraft. We have set up this repository on GitHub in case you want to try this out yourself. To fix this CurseForge lag, follow this guide: 1. Step 2: Open your Minecraft launcher, select the version you wish to apply the argument to, and click edit profile. Below is the list of features. or your device is just bad in general. So, I recently found out about directly allocating RAM using some JVM argument. When the heap size is not set, OpenJ9 will only acquire a small amount of memory at startup (ideal for cloud environment), and grows the heap as the application runs. Please just assume I am mostly a Java Newb, with almost 0 coding experience. The old method opens the minecraft launcher, just as if I double clicked the jar file, however it does not go directly. It resets your JVM arguments to its own defaults and it actually set some bad ones, like the -Xms256m I mentioned above. The /r/feedthebeast subreddit is not affiliated or associated with the Feed. This will be huge for modded after Minecraft 1. Opened the FTB Launcher 3. Then copy and paste the Java Arguments from the first post in this thread into the Additional. 7. Xmn needs to be set to ¼ the size [of Xmx] [citation needed] Edit: and yes i know he is tagged as "Mod Pack Team", but i still remain sceptical, since my tests came to a opposite result. Then go on JVM Arguments and put -Xmx4G -XX:+UnlockExperimentalVMOptions -XX:+UseZGCAlso important: JVM arguments are case-sensitive; Try to install the non-native version of Java (the download can be found here). Why do I still play in 1. Then add the amount of RAM you would like to the JVM Arguments text box. I was looking into the JVM arguments to see if I could make the changes there but I'm not sure exactly what I am doing as far as the curse launcher goes. There’s also Xms, though. You shouldn't use more than 20GB of RAM, G1GC could start to struggle… Sources.