[Question] Large size type annotation file cause low performance. Is it possible to fix it?

Nobody has claimed this yet.

In my project I have a special Lua file used to give type hint, it defines many field such as:
```
---@class UnityEngine.TransitionType
---@field Normal UnityEngine.TransitionType
---@field Entry UnityEngine.TransitionType
---@field Exit UnityEngine.TransitionType
UnityEngine.TransitionType = {}

---@class UnityEngine.StateInfoIndex
---@field CurrentState UnityEngine.StateInfoIndex
---@field NextState UnityEngine.StateInfoIndex
---@field ExitState UnityEngine.StateInfoIndex
---@field InterruptedState UnityEngine.StateInfoIndex
UnityEngine.StateInfoIndex = {}

--- ...more below
```
It contains all type using in my project so it's very large (about 5000KB), and caused low diagnostic speed when LLS runs.
Is it possible to optimize performance for those special type annotation file? Or I have to simplify this Lua file.

Reproduce the slowdown with the reported 5,000 KB Lua type-annotation file and compare diagnostic speed against a smaller file. Trace the diagnostic path that processes the annotations; done means the large-file case has substantially improved performance without losing type information.

Written by the indexing model from the issue text.