Some bad ts performance cases

[tjx666]

Steps to reproduce

I write many details in the readme of https://github.com/tjx666/ts-perf-issue

Current behavior

The cases described in https://github.com/tjx666/ts-perf-issue/tree/main still bad ts performance

Expected behavior

Improve these cases performance.

Context

https://github.com/tjx666/ts-perf-issue

Your environment

npx @mui/envinfo

 System:
    OS: macOS 14.5
  Binaries:
    Node: 20.15.0 - ~/.local/state/fnm_multishells/22122_1719478157230/bin/node
    npm: 10.7.0 - ~/.local/state/fnm_multishells/22122_1719478157230/bin/npm
    pnpm: 9.4.0 - ~/.local/state/fnm_multishells/22122_1719478157230/bin/pnpm
  Browsers:
    Chrome: 126.0.6478.127
    Edge: Not Found
    Safari: 17.5
  npmPackages:
    @mui/lab: 5.0.0-alpha.170 => 5.0.0-alpha.170 
    @mui/material: ^5.15.20 => 5.15.20 
    @types/react: ^18.3.3 => 18.3.3 
    react: ^18.3.1 => 18.3.1 
    typescript: ^5.5.2 => 5.5.2

Search keywords: typescript, suggestion, slow, bad, performace, sxProps, createTheme, @mui/system

[siriwatknp]

Thank you so much for the detail explanations!

[mikk809h]

I just discovered that in my case, i had performance issues completely disappear when removing the @mui/icons-material package.

Then i tried downgrading to an older version and that seem to have improved my performance by a lot.

Version 5.11.11 seem to be much more stable in performance, but it requires the use of the --legacy-peer-deps flag.
"@mui/icons-material": "^5.11.11"

I noted the issues happening here. (I have not tried other versions)
"@mui/icons-material": "^6.1.4"

My Package.json

  
  "dependencies": {
    "@emotion/cache": "^11.13.1",
    "@emotion/react": "^11.13.3",
    "@emotion/styled": "^11.13.0",
    "@fontsource/roboto": "^5.1.0",
    "@mdx-js/loader": "^3.0.1",
    "@mdx-js/react": "^3.0.1",
    "@mui/icons-material": "^5.11.11",
    "@mui/material": "^6.1.4",
    "@mui/material-nextjs": "^6.1.4",
    "@next/mdx": "^14.2.15",
    "gray-matter": "^4.0.3",
    "mdast-util-to-string": "^4.0.0",
    "next": "14.2.15",
    "react": "^18",
    "react-dom": "^18",
    "rehype-autolink-headings": "^7.1.0",
    "rehype-slug": "^6.0.0",
    "remark": "^15.0.1",
    "remark-footnotes": "^5.0.0",
    "remark-frontmatter": "^5.0.0",
    "remark-gfm": "^4.0.0",
    "remark-mdx-images": "^3.0.0",
    "unist-util-visit": "^5.0.0"
  },
  "devDependencies": {
    "@types/mdx": "^2.0.13",
    "@types/node": "22.7.6",
    "@types/react": "^18",
    "@types/react-dom": "^18",
    "eslint": "^8",
    "eslint-config-next": "14.2.15",
    "typescript": "^5"
  }

OS Environment

npx @mui/envinfo

 System:
    OS: Windows 11 10.0.22631
  Binaries:
    Node: 20.15.0 - C:\Program Files\nodejs\node.EXE
    npm: 10.7.0 - C:\Program Files\nodejs\npm.CMD
    pnpm: 9.9.0 - C:\Program Files\nodejs\pnpm.CMD
  Browsers:
    Chrome: Not Found
    Edge: Chromium (128.0.2739.54)
  npmPackages:
    @emotion/react: ^11.13.3 => 11.13.3
    @emotion/styled: ^11.13.0 => 11.13.0
    @mui/core-downloads-tracker:  6.1.4
    @mui/icons-material: ^5.11.11 => 5.16.7
    @mui/material: ^6.1.4 => 6.1.4
    @mui/material-nextjs: ^6.1.4 => 6.1.4
    @mui/private-theming:  6.1.4
    @mui/styled-engine:  6.1.4
    @mui/system:  6.1.4
    @mui/types:  7.2.18
    @mui/utils:  6.1.4
    @types/react: ^18 => 18.3.11
    react: ^18 => 18.3.1
    react-dom: ^18 => 18.3.1
    typescript: ^5 => 5.6.3

[gkiely]

I started seeing degraded code completion performance from @mui/icons-material: "6.1.0", downgrading to @mui/icons-material: "6.0.2" fixed the issue.