性能问题 CPU占用高

### How are you using the lua-language-server?

Visual Studio Code Extension (sumneko.lua)

### Which OS are you using?

Windows

### What is the issue affecting?

Other

### Expected Behaviour

CPU 占用不应该偏高

### Actual Behaviour

当项目和单个文件有一定的规模时，CPU 占用偏高

### Reproduction steps

1. 项目整体规模有一定的影响。以下是项目大概规模
```
-------------------------------------------------------------------------------
Language files blank comment code
-------------------------------------------------------------------------------
Lua 186 9067 25097 31556
```
2. 单个文件大小是主要因素。问题明显出现是在一个用于临时测试的文件，该文件有 6000 多行，其中主要为 if 结构，包含约 330 个测试分支。在这个文件中一旦编辑一下，lua-language-server.exe 就 CPU 占用较高， 5%-9% 左右，散热风扇就开始转很快，补全和提示就会产生严重延迟。
3. 当前文件不大时没有问题。

### Additional Notes

_No response_

### Log File

_No response_

No source file, test, or entry point is named. Reproduce on Windows with the reported 6,000-line Lua file and roughly 330 branches, then investigate the language server's CPU usage after edits; done means lower CPU usage without the reported completion and diagnostic delays.

Written by the indexing model from the issue text.