Compile on save very slow

### Apache NetBeans version

Apache NetBeans 21

### What happened

Compile on save very slow, it takes around 5 sec to 30 sec to generate the class file in target folder. Any way to speed this up?

### Language / Project Type / NetBeans Component

_No response_

### How to reproduce

create a default spring-boot project, then you see

### Did this work correctly in an earlier version?

No / Don't know

### Operating System

windows

### JDK

17

### Apache NetBeans packaging

Apache NetBeans provided installer

### Anything else

_No response_

### Are you willing to submit a pull request?

No

No source file, test, or NetBeans component is identified. Reproduce the delay with a default Spring Boot project on Windows using Apache NetBeans 21 and JDK 17, then trace compile-on-save until the target class-file generation is located. Done means the reported 5–30 second delay is reduced and verified with a regression test or documented measurement.

Written by the indexing model from the issue text.