TypeScript-Go Performance Issue in ci (github action)

[ChrisWiles]

TypeScript-Go (tsgo) is performing much slower than expected — only about 28% faster than tsc (57s vs. 79s), whereas the promise was a 10x improvement (~7.9s). This is significantly below expectations.

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Performance Results

Tool	Duration	Improvement
tsc	79s	–
tsgo	57s	~28% faster

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Environment

• CI Platform: GitHub Actions (ubuntu-latest, x86_64)

• Node.js: v20.15.0

• Memory: Standard runner allocation

• Project: Large React Native (Expo bare)

• Lines of Code: ~322K

• TypeScript: 5.8.3

• TypeScript-Go: @typescript/[email protected]

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TypeScript Configuration

• Strict Mode with multiple strict flags

• Path Mapping: (@kojo/*, @graphql/*, etc.)

• Target: ES2023, JSX: react-jsx

• Incremental Compilation: Enabled

• Skip Lib Check: Enabled

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Command Setup

{
  "lint:typecheck": "node --max-old-space-size=8192 ./node_modules/.bin/tsc --noEmit",
  "lint:typecheck:tsgo": "tsgo --noEmit"
}

Any ideas or suggestions?