Performance tuning parameters for IntelliJ IDEA. Add these params in idea64.exe.vmoptions or idea.exe.vmoptions file in IntelliJ IDEA. If you are using JDK 8.x, please knock off PermSize and MaxPermSize parameters from the tuning configuration.

IntelliJ_IDEA__Perf_Tuning.txt

-server
-Xms2048m
-Xmx2048m
-XX:NewSize=512m
-XX:MaxNewSize=512m
-XX:PermSize=512m
-XX:MaxPermSize=512m
-XX:+UseParNewGC
-XX:ParallelGCThreads=4
-XX:MaxTenuringThreshold=1
-XX:SurvivorRatio=8
-XX:+UseCodeCacheFlushing
-XX:+UseConcMarkSweepGC
-XX:+AggressiveOpts
-XX:+CMSClassUnloadingEnabled
-XX:+CMSIncrementalMode
-XX:+CMSIncrementalPacing
-XX:+CMSParallelRemarkEnabled
-XX:CMSInitiatingOccupancyFraction=65
-XX:+CMSScavengeBeforeRemark
-XX:+UseCMSInitiatingOccupancyOnly
-XX:ReservedCodeCacheSize=64m
-XX:-TraceClassUnloading
-ea
-Dsun.io.useCanonCaches=false

@indiff there's a username in those options

A merged from @indiff, @iuriimattos and with JetBrains PhpStorm 2023.2.1RC from a fresh win11 installation default options and some old stuff, I use it in host and client (wsl2) vmoptions.

-Dawt.java2d.opengl=true
-Dawt.lock.fair=true
-Dawt.useSystemAAFontSettings=lcd
-Dfile.encoding=UTF-8
-Dhidpi=true
-Dide.ui.scale=1.0
-Djava.net.preferIPv4Stack=true
-Djbr.catch.SIGABRT=true
-Djdk.attach.allowAttachSelf=true
-Djdk.http.auth.tunneling.disabledSchemes=""
-Djdk.module.illegalAccess.silent=true
-Djsse.enablesSNIExtension=false
-Dkotlinx.coroutines.debug=off
-Dsun.awt.keepWorkingSetOnMinimize=true
-Dsun.io.useCanonCaches=false
-Dsun.java2d.metal=true
-Dsun.java2d.uiScale.enabled=false
-Dsun.tools.attach.tmp.only=true

-XX:+AlwaysPreTouch
-XX:+CMSClassUnloadingEnabled
-XX:+CMSParallelRemarkEnabled
-XX:+CMSPermGenSweepingEnabled
-XX:+CMSScavengeBeforeRemark
-XX:+HeapDumpOnOutOfMemoryError
-XX:+HeapDumpOnOutOfMemoryError
-XX:+HeapDumpOnOutOfMemoryError
-XX:+IgnoreUnrecognizedVMOptions
-XX:+TieredCompilation
-XX:+UseCMSCompactAtFullCollection
-XX:+UseCMSInitiatingOccupancyOnly
-XX:+UseCodeCacheFlushing
-XX:+UseConcMarkSweepGC
-XX:+UseG1GC
-XX:+UseStringDeduplication
-XX:-OmitStackTraceInFastThrow
-XX:-TraceClassUnloading
-XX:AutoBoxCacheMax=20000
-XX:CICompilerCount=2
-XX:CMSFullGCsBeforeCompaction=0
-XX:CMSInitiatingOccupancyFraction=65
-XX:CompileCommand=exclude,com/intellij/openapi/vfs/impl/FilePartNodeRoot,trieDescend
-XX:ConcGCThreads=4
-XX:MaxMetaspaceSize=512m
-XX:MaxNewSize=1g
-XX:MaxTenuringThreshold=1
-XX:MetaspaceSize=512m
-XX:NewRatio=1
-XX:NewSize=512m
-XX:ParallelGCThreads=4
-XX:ReservedCodeCacheSize=512m
-XX:SoftRefLRUPolicyMSPerMB=50
-XX:SurvivorRatio=8

-Xms1g
-Xmx4g

-ea