Fresh install (4.0.2) very UNresponsive

Strange indeed. Did you use the standard JJazzLab installer from the website ? It embeds its own Java runtime so you don't have to do anyting with Java.

Please post the log file jjazzlab.gitbook.io/user-guide/faq#how-to-submit-a-bug-how-to-find-the-log-file

>Log Session: Friday, April 26, 2024 at 2:09:39 PM Central Daylight Time
>System Info:
Product Version = JJazzLab 20-91f9ed846ac143b52d50b5ea323a42c2f7e78392
Operating System = Windows 11 version 10.0 running on amd64
Java; VM; Vendor = 17.0.9; OpenJDK 64-Bit Server VM 17.0.9+9; Eclipse Adoptium
Runtime = OpenJDK Runtime Environment 17.0.9+9
Java Home = C:\Program Files\JJazzLab\jdk
System Locale; Encoding = en_US (jjazzlab); Cp1252
Home Directory = C:\Users\dnutt
Current Directory = C:\Program Files\JJazzLab
User Directory = C:\Users\dnutt\AppData\Roaming\jjazzlab\4.0.2
Cache Directory = C:\Users\dnutt\AppData\Local\jjazzlab\Cache\4.0.2
Installation = C:\Program Files\JJazzLab\bin
C:\Program Files\JJazzLab\etc
C:\Program Files\JJazzLab\extra
C:\Program Files\JJazzLab\jjazzlab
C:\Program Files\JJazzLab\platform
C:\Program Files\JJazzLab\platform
Boot & Ext. Classpath =
Application Classpath = C:\Program Files\JJazzLab\platform\lib\boot.jar;C:\Program Files\JJazzLab\platform\lib\org-openide-modules.jar;C:\Program Files\JJazzLab\platform\lib\org-openide-util-lookup.jar;C:\Program Files\JJazzLab\platform\lib\org-openide-util-ui.jar;C:\Program Files\JJazzLab\platform\lib\org-openide-util.jar
Startup Classpath = C:\Program Files\JJazzLab\platform\core\asm-9.5.jar;C:\Program Files\JJazzLab\platform\core\asm-commons-9.5.jar;C:\Program Files\JJazzLab\platform\core\asm-tree-9.5.jar;C:\Program Files\JJazzLab\platform\core\core-base.jar;C:\Program Files\JJazzLab\platform\core\core.jar;C:\Program Files\JJazzLab\platform\core\org-netbeans-libs-asm.jar;C:\Program Files\JJazzLab\platform\core\org-openide-filesystems.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_de_DE.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_es_ES.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_fr_FR.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_id_ID.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_it_IT.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_ja_JP.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_ko_KR.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_no_NO.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_pt_BR.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_ru_RU.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_uk_UA.jar;C:\Program Files\JJazzLab\jjazzlab\core\locale\core_jjazzlab_zh_CN.jar
-------------------------------------------------------------------------------
INFO [MixPanelProcessor]: MixPanelProcessor() distinctId=17bc992182
INFO [LookAndFeelInstaller]: validate() Installing Look & Feel: com.formdev.flatlaf.FlatDarkLaf
INFO [FluidSynthJava]: loadNativeLibraries() Success
WARNING [org.openide.filesystems.Ordering]: Not all children in Toolbars/ marked with the position attribute: [AutoPreviewToolBar, MusicControls, MyToolBarConfig.xml], but some are: [File, Clipboard, UndoRedo, Memory]
INFO [JJazzLabSequencer]: JJazzLabSequencer() Setting up JJazzLab sequencer
INFO [JJazzMidiSystem]: JJazzMidiSystem() Midi out devices=[{name=Microsoft MIDI Mapper,maxReceivers=-1,maxTransmitters=0}, {name=CoolSoft MIDIMapper,maxReceivers=-1,maxTransmitters=0}, {name=Microsoft GS Wavetable Synth,maxReceivers=-1,maxTransmitters=0}, {name=VirtualMIDISynth #1,maxReceivers=-1,maxTransmitters=0}]
INFO [org.netbeans.ui.metrics.laf]: USG_LOOK_AND_FEEL
INFO [StartupManager]: Launcher.run() Starting task: Copy default Midi synth definition files priority=100
INFO [StartupManager]: Launcher.run() Starting task: Copy default rhythm files priority=500
INFO [StartupManager]: Launcher.run() Starting task: Create Rhythm database priority=501
INFO [StartupManager]: Launcher.run() Starting task: Open command line and recent files priority=600
INFO [StartupManager]: Launcher.run() Starting task: Copy example song files priority=1,000
INFO [RhythmDatabaseImpl]: initDatabase() needRescan=false cacheFilePresent=true
INFO [RhythmDatabaseImpl]: addNewRhythmsFromRhythmProviders() excludeBuiltinRhythms=false excludeFileRhythms=true forceFileRescan=false. Added 8 rhythms
INFO [RhythmDatabaseImpl]: readCache() Successfully read rhythm list from cache, size=155
INFO [RhythmDatabaseImpl]: logStats() Rythm Database stats - total=163
INFO [RhythmDatabaseImpl]: > YamJJazz extended styles: total=5 builtin=0 file=5 first=Rinfo[16beat.S556.yjz-4/4]...
INFO [RhythmDatabaseImpl]: > Dummy rhythms: total=8 builtin=8 file=0 first=Rinfo[DummyName-2/4-2/4]...
INFO [RhythmDatabaseImpl]: > YamJJazz standard styles: total=150 builtin=0 file=150 first=Rinfo[16BeatBallad2.S014.prs-4/4]...
Diagnostic information
Input arguments:
-Dmp.token=a67ed8aa58b306c1336dcf74fb99b2f69f1
-Dnetbeans.modules.quiet=true
--add-modules=jdk.incubator.foreign
--enable-native-access=ALL-UNNAMED
--enable-preview
--add-opens=java.base/java.net=ALL-UNNAMED
--add-opens=java.base/java.lang=ALL-UNNAMED
--add-opens=java.desktop/javax.swing=ALL-UNNAMED
--add-exports=java.desktop/sun.awt=ALL-UNNAMED
--add-opens=java.base/java.util=ALL-UNNAMED
-Djjazzlab.version=4.0.2
-Dnetbeans.user.dir=C:\Program Files\JJazzLab\bin
-Djdk.home=C:\Program Files\JJazzLab\jdk
-Dnetbeans.home=C:\Program Files\JJazzLab\platform
-Dnetbeans.user=C:\Users\dnutt\AppData\Roaming\jjazzlab\4.0.2
-Dnetbeans.default_userdir_root=C:\Users\dnutt\AppData\Roaming\jjazzlab
-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=C:\Users\dnutt\AppData\Roaming\jjazzlab\4.0.2\var\log\heapdump.hprof
-Dsun.awt.keepWorkingSetOnMinimize=true
-Djava.security.manager=allow
-Dnetbeans.dirs=C:\Program Files\JJazzLab\bin;C:\Program Files\JJazzLab\etc;C:\Program Files\JJazzLab\extra;C:\Program Files\JJazzLab\jjazzlab;C:\Program Files\JJazzLab\platform
exit
Compiler: HotSpot 64-Bit Tiered Compilers
Heap memory usage: initial 512.0MB maximum 8140.0MB
Non heap memory usage: initial 7.3MB maximum -1b
Garbage collector: G1 Young Generation (Collections=7 Total time spent=0s)
Garbage collector: G1 Old Generation (Collections=0 Total time spent=0s)
Classes: loaded=7794 total loaded=7794 unloaded 0
INFO [org.netbeans.core.ui.warmup.DiagnosticTask]: Total memory 34,141,401,088
INFO [null]: Total physical memory 34,141,401,088
INFO [YamahaRhythmProvider]: readFast() Reading C:\Users\dnutt\JJazzLab\Rhythms\Pop&Rock\CoolBand.S053.sty
INFO [YamJJazzRhythmProvider]: readFast() Reading C:\Program Files\JJazzLab\jjazzlab\modules\YamJJazzDefaultFiles\16beat.S556.yjz and 16beat.S556.prs
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: BossaNova.STY-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: JazzBluesSimple.S740.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: JazzWaltzFast.S499.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: CoolPop.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: JazzWaltzFast.S499.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: PopRumba.S625.bcs-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: CoolPop.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: BossaNova.STY-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: JazzBluesSimple.S740.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: JazzWaltzFast.S499.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: CoolPop.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: JazzWaltzFast.S499.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: PopRumba.S625.bcs-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: CoolPop.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: BossaNova.STY-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: JazzBluesSimple.S740.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: JazzWaltzFast.S499.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: CoolPop.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: JazzWaltzFast.S499.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: PopRumba.S625.bcs-ID
WARNING [org.jjazz.yamjjazz.rhythm.ImprovisorImporter]: initMap() No rhythm found for rhythmId: CoolPop.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: BossaNova.STY-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: JazzBluesSimple.S740.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: JazzWaltzFast.S499.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: CoolPop.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: JazzWaltzFast.S499.sty-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: PopRumba.S625.bcs-ID
WARNING [org.jjazz.yamjjazz.rhythm.XmlImporter]: initMap() No rhythm found for rhythmId: CoolPop.sty-ID

Turning Avast OFF definitely improves the responsiveness.   I also shut off some other "non-essential" programs that start during boot.