java.util.regex.Pattern class sluggishness

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Type: Performance Issue

Everytime I reference the java.util.regex.Pattern class in VSCode, it takes a solid 2 something seconds for the intellisense to catch up.

So for example, if I do:

Pattern., the tooltip that shows all the available methods takes a while to actually load in.

I don't have this issue with any other classes.

Extension version: 1.47.0
VS Code version: Code 1.105.1 (7d842fb85a0275a4a8e4d7e040d2625abbf7f084, 2025-10-14T22:33:36.618Z)
OS version: Windows_NT x64 10.0.26200
Modes:

System Info

Item	Value
CPUs	Intel(R) Core(TM) i5-14400F (16 x 2496)
GPU Status	2d_canvas: enabled direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off trees_in_viz: disabled_off video_decode: enabled video_encode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	31.84GB (20.14GB free)
Process Argv	--crash-reporter-id 33ebd6ef-09c3-4842-8740-f2a7cee857a7
Screen Reader	no
VM	0%

Process Info

CPU %	Mem MB	   PID	Process
    0	   138	 30928	code
    0	    32	  1776	   crashpad-handler
    0	   116	  5628	   gpu-process
    0	   284	 11140	window [1] (Running Extensions - test-java - Visual Studio Code)
    0	   114	 17352	file-watcher [1]
    0	   117	 20052	pty-host
    0	    91	  5276	     C:\WINDOWS\System32\WindowsPowerShell\v1.0\powershell.exe -noexit -command "try { . \"c:\Users\Jeremiah Wright\AppData\Local\Programs\Microsoft VS Code\resources\app\out\vs\workbench\contrib\terminal\common\scripts\shellIntegration.ps1\" } catch {}"
    0	     8	 27956	     conpty-agent
    0	    49	 23520	   utility-network-service
    0	   185	 30568	extension-host [1]
    0	   892	 25848	     "c:\Users\Jeremiah Wright\.vscode\extensions\redhat.java-1.47.0-win32-x64\jre\21.0.8-win32-x86_64\bin\java" --add-modules=ALL-SYSTEM --add-opens java.base/java.util=ALL-UNNAMED --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/sun.nio.fs=ALL-UNNAMED -Declipse.application=org.eclipse.jdt.ls.core.id1 -Dosgi.bundles.defaultStartLevel=4 -Declipse.product=org.eclipse.jdt.ls.core.product -Djava.import.generatesMetadataFilesAtProjectRoot=false -DDetectVMInstallationsJob.disabled=true -Dfile.encoding=utf8 -XX:+UseParallelGC -XX:GCTimeRatio=4 -XX:AdaptiveSizePolicyWeight=90 -Dsun.zip.disableMemoryMapping=true -Xmx2G -Xms100m -Xlog:disable "-javaagent:c:\Users\Jeremiah Wright\.vscode\extensions\redhat.java-1.47.0-win32-x64\lombok\lombok-1.18.39-4050.jar" -XX:+HeapDumpOnOutOfMemoryError "-XX:HeapDumpPath=c:\Users\Jeremiah Wright\AppData\Roaming\Code\User\workspaceStorage\9859a0f0e70baece4bfc91dbe050b5f3\redhat.java" -Daether.dependencyCollector.impl=bf -jar "c:\Users\Jeremiah Wright\.vscode\extensions\redhat.java-1.47.0-win32-x64\server\plugins\org.eclipse.equinox.launcher_1.7.100.v20251014-1222.jar" -configuration "c:\Users\Jeremiah Wright\AppData\Roaming\Code\User\globalStorage\redhat.java\1.47.0\config_win" -data "c:\Users\Jeremiah Wright\AppData\Roaming\Code\User\workspaceStorage\9859a0f0e70baece4bfc91dbe050b5f3\redhat.java\jdt_ws" --pipe=\\.\pipe\lsp-29f0832911fad8f693384ca7a1de459f-sock
    0	   134	 30760	shared-process

Workspace Info

|  Window (Running Extensions - test-java - Visual Studio Code)
|    Folder (test-java): 1 files
|      File types: java(1)
|      Conf files:;

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Riproduci il ritardo aprendo un file Java in VS Code con l’estensione vscode-java e richiamando il completamento dopo aver digitato Pattern.. Confronta la reattività del completamento per java.util.regex.Pattern con quella di altre classi e analizza il processo del server del linguaggio Java mostrato nel report. Il lavoro è completato quando viene identificata la causa specifica del ritardo di circa due secondi e il completamento risponde normalmente.

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