https://github.com/hrsh7th/slow-lsp-demo

https://github.com/hrsh7th/slow-lsp-demo

Last synced: 8 months ago
JSON representation

• Host: GitHub
• URL: https://github.com/hrsh7th/slow-lsp-demo
• Owner: hrsh7th
• Created: 2021-11-29T16:00:02.000Z (almost 4 years ago)
• Default Branch: main
• Last Pushed: 2021-11-29T16:32:12.000Z (almost 4 years ago)
• Last Synced: 2025-01-03T08:14:01.021Z (10 months ago)
• Language: TypeScript
• Size: 5.86 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

          
# slow-lsp-demo

In the past time, the neovim builtin-lsp and Lua based completion plugin slows down when using the old typescript-language-server.

This problem was caused by the following reasons...

#### 1. The previous version of typescript-language-server behavior

The previous version of typescript-language-server returns toooooo many completion items.

-> Now, typescript-language-server uses `isIncomplete=true` and the payload is small as enough.

#### 2. The previous version of nvim built-in lsp was using `vim.fn.json_decode` to parse LSP payloads.

It may take a time near 100ms if the payload toooo large.

-> Now, nvim built-in lsp uses `cjson` as the JSON parser. It quit faster than old one.

#### 3. The previous version of nvim built-in lsp convert `vim.NIL` as `nil` via recursive processing.

It may take a time near 100ms if the payload toooo large.

-> Now, nvim built-in lsp converts `vim.NIL` to `nil` when parsing that is avoiding extra recursive processing.

NOTE: The completion plugin was the slowness reason too (but it isn't the core reason).

# How can I reproduce the slowness with this repo?

1. Downgrade the nvim.

2. Downgrade the typescript-language-server as `0.4.0`

3. Run `npm install`

4. Invoke completion with `<|>` on `src/index.ts`