Minecraft Forums

Quote from smoke_TH

start javaw -Xms4096K -Xss128M -Xmx2048M -XX:PermSize=24m -XX:MaxPermSize=32m -XX:+UseParallelOldGC -XX:ParallelGCThreads=4 -XX:+CMSIncrementalPacing -XX:+AggressiveOpts -XX:+UseThreadPriorities -XX:+UseFastAccessorMethods -XX:+UseBiasedLocking -XX:+UseStringCache -XX:+TieredCompilation -XX:SurvivorRatio=8 -Dsun.java2d.noddraw=true -Dsun.java2d.d3d=false -Dsun.java2d.opengl=true -jar Spoutcraft-Launcher.jar

Use this, replace spoutcraft-launcher.jar with .exe of minecraft launcher. Set xmx to be 1/2 or more of your ram (depending if you want other apps work well), also set parallelGCThreads to equal total number of cores on your PC.If something goes wrong remove -XX:+UseBiasedLocking -XX:+TieredCompilation, and if you'll have troubles and graphical artifacts try replacing noddraw=false d3d=true opengl=false to switch onto direct 3d rendering.There, saved you 5 hours of looking through java docs.

I clean it up:

-Xmx2g -Xms4m -Xss128M -XX:MaxPermSize=32m -XX:PermSize=24m -XX:+UseParallelOldGC -XX:ParallelGCThreads=4 -XX:+CMSIncrementalPacing -XX:SurvivorRatio=8 -XX:+AggressiveOpts -XX:+UseThreadPriorities -XX:+UseBiasedLocking -XX:+UseStringCache -XX:+TieredCompilation -XX:+UseFastAccessorMethods -Dsun.java2d.noddraw=true -Dsun.java2d.d3d=false -Dsun.java2d.opengl=true

Then I remove flags with default value (SurvivorRatio, UseThreadPriorities, UseBiasedLocking)(Use -XX:PrintFlagsFinal):

-Xmx2g -Xms4m -Xss128M -XX:MaxPermSize=32m -XX:PermSize=24m -XX:+UseParallelOldGC -XX:ParallelGCThreads=4 -XX:+CMSIncrementalPacing -XX:+AggressiveOpts -XX:+UseStringCache -XX:+TieredCompilation -XX:+UseFastAccessorMethods -Dsun.java2d.noddraw=true -Dsun.java2d.d3d=false -Dsun.java2d.opengl=true

-Dsun.java2d.d3d and -Dsun.java2d.noddraw are the same and useless.
I also add OptimizeStringConcat and UseCompressedStrings as addition to UseStringCache.UseFastAccessorMethods can actually hurt your performance. (here)
You can't use CMSIncrementalPacing without UseConcMarkSweepGC and he is anyway better than the UseParallelOldGC.
I use -Xincgc because he doing both plus UseParNewGC. -Xss128M is an ultra overkill which my computer can't open (default is 512K!!!).

-Xmx1g -Xms1g -Xss256k -XX:MaxPermSize=32m -XX:PermSize=24m -Xincgc -XX:ParallelGCThreads=2 -XX:+AggressiveOpts -XX:+UseStringCache -XX:+OptimizeStringConcat -XX:+UseCompressedStrings -XX:+TieredCompilation -Dsun.java2d.opengl=true

For java 8 (PermGen is deprecated and also CMSIncrementalMode&CMSIncrementalPacing):

-Xmx1g -Xms1g -Xss256k -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:ParallelGCThreads=2 -XX:+AggressiveOpts -XX:+TieredCompilation -Dsun.java2d.opengl=true

For desperate people:

-Xmx512m -Xms512m -Xss128k -XX:UseParallelOldGC -XX:ParallelGCThreads=2 -XX:+AggressiveOpts -XX:+TieredCompilation -Dsun.java2d.opengl=true

I have a laptop with theses specs
- nividia gt750m gddrr5 2gb
-i7 4500u
- 8gb ddr3 ram
-1920x1080p display
- 1tb hdd 5400 rpm


Plzz dont say my rig is bad because i had a worse laptop and it got better fps in minecraft
Basically i only get about 90-120 fps (not a big deal as its smooth) but when i try to record minecraft it drops to 30-40 and its very choppy and unplayable as i upload mcsg (MineCraft Survival Games). on my old laptop with a i5 4200u and gt740m 4gb ram and i got 90-100 fps while recording i use bandicam to record.

Should I update LWJGL if it says the article says it's out of date?

hey there, im old to minecraft but new to the forum

i just came to say to that guy who posted the topic about speeding up minecraft, it worked very well with me

before.. i had like 40 to 55fps while playing at far all max, but i used to disable Advanced OpenGL (since i thought it slows the game down)

but when i looked here, you said "Enable Advanced OpenGL".. i was more like (hmm..) and tried that out, that hopped my fps from 55 to 135FPS!

that was just freakin awesome! downloaded JREZ and i don't know if it has speeded up the game or not, but it did not slow it down, im sure.



so for all people, trust this guy, he made a nice topic out there

span>2058mb is A LOT of new mobs like mo creature, humans+, pokemobs, etc. Also if you have out of memory problems. 4096 is unnecessarily high, but it is possible. These are in megabytes so 1024 is a gigabyte of ram. Adding more memory than default may help if you have a lot of spare RAM.

Instead of allocating 2048mb (2gb) You can allocate 1536mb (1.5gb) with little to no difference.