[vscode] Spring Boot Tools slow down code complete

[degbug]

Describe the bug
when I install Spring Boot Tools in vscode, it slow down the speed of code completions.

I seen the plugin log show :

11:47:32.155 [pool-8-thread-1] INFO  o.s.i.v.c.l.u.SimpleTextDocumentService - change message work done in 1723ms

To Reproduce

Sample

https://github.com/degbug/demo

this is the log file:
boot.log.txt

[martinlippert]

Thanks for reporting this @degbug. Slowing down typing speed or completion performance is an absolute no-go here. We need to investigate. Thanks for attaching the log output, that is a great starting point.

From what I can see, it looks like the slowdown happens sometimes, and sometimes it doesn't. Did you observe any special action or sequence of activities that triggers the slowdown?

[degbug]

Thanks for reporting this @degbug. Slowing down typing speed or completion performance is an absolute no-go here. We need to investigate. Thanks for attaching the log output, that is a great starting point.

From what I can see, it looks like the slowdown happens sometimes, and sometimes it doesn't. Did you observe any special action or sequence of activities that triggers the slowdown?

@martinlippert No, I didn't observed. When I first open the project and first typing is quickly, but then it become very easy to triggers the slowdown. But I don't know what cause this.
The log file contains many error log, this may affect this?

[youngm]

I'm having a similar issue with 4.15.2 on eclipse. I didn't have time to dig into it and create an issue/reproduction. I had to revert to 4.15.1 to get my work done.

[BoykoAlex]

@degbug please try this vsix and let us know if this works better for you: https://s3.us-west-1.amazonaws.com/s3-test.spring.io/sts4/vscode-extensions/snapshots/vscode-spring-boot-1.38.0-202208052243.vsix
@youngm please try upgrading STS eclipse from the snapshot update site. Should be good to update on Monday. Curious if it works any better: https://dist.springsource.com/snapshot/TOOLS/sts4/nightly/e4.24

[degbug]

@degbug please try this vsix and let us know if this works better for you: https://s3.us-west-1.amazonaws.com/s3-test.spring.io/sts4/vscode-extensions/snapshots/vscode-spring-boot-1.38.0-202208052243.vsix @youngm please try upgrading STS eclipse from the snapshot update site. Should be good to update on Monday. Curious if it works any better: https://dist.springsource.com/snapshot/TOOLS/sts4/nightly/e4.24

@BoykoAlex I have try vscode-spring-boot-1.38.0-202208052243.vsix, It works better than before. but still work slow than disable the vscode-spring-boot extensions.

this is the log file:
boot.log6.txt

And I saw error in log:

11:19:21.762 [pool-3-thread-1] ERROR o.s.i.v.b.j.utils.SymbolCacheOnDisc - cannot write symbol cache
java.io.FileNotFoundException: /Users/degbug/.sts4/.symbolCache/degbug-auto-task-java--A71297B3246476FA87DEC5893F93A8BB.json (Too many open files)
	at java.base/java.io.FileOutputStream.open0(Native Method)
	at java.base/java.io.FileOutputStream.open(Unknown Source)
	at java.base/java.io.FileOutputStream.<init>(Unknown Source)
	at java.base/java.io.FileOutputStream.<init>(Unknown Source)
	at java.base/java.io.FileWriter.<init>(Unknown Source)
	at org.springframework.ide.vscode.boot.java.utils.SymbolCacheOnDisc.save(SymbolCacheOnDisc.java:259)
	at org.springframework.ide.vscode.boot.java.utils.SymbolCacheOnDisc.update(SymbolCacheOnDisc.java:236)
	at org.springframework.ide.vscode.boot.java.utils.SpringIndexerJava.scanFilesInternally(SpringIndexerJava.java:316)
	at org.springframework.ide.vscode.boot.java.utils.SpringIndexerJava.scanAffectedFiles(SpringIndexerJava.java:347)
	at org.springframework.ide.vscode.boot.java.utils.SpringIndexerJava.scanFiles(SpringIndexerJava.java:191)
	at org.springframework.ide.vscode.boot.java.utils.SpringIndexerJava.updateFiles(SpringIndexerJava.java:145)
	at org.springframework.ide.vscode.boot.app.SpringSymbolIndex.lambda$updateItems$28(SpringSymbolIndex.java:727)
	at java.base/java.util.concurrent.CompletableFuture$AsyncRun.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)