# TypeScript 7 is fast

> Source: <https://manveerbhullar.com/writing/typescript-7-upgrade/>
> Published: 2026-07-08 00:00:00+00:00

This post is AI written based on my tests and direction from me.

I upgraded the RoleReady monorepo from TypeScript 6.0.2 to 7.0.2. App typecheck (`tsc --noEmit`

):

| Build | `tsc --noEmit` |
|---|---|
| TypeScript 6.0.2 | 27.4s |
| TypeScript 7.0.2 | 4.2s |

Same machine, same codebase. About 6.5x faster. Diagnostics were identical.

## How I measured

Apple M1 Max, cold runs. Deleted `.tsbuildinfo`

between each pass.

Three runs of each:

- TS 6.0.2: 27.43s, 27.19s, 27.51s
- TS 7.0.2: 4.14s, 4.18s, 4.23s

I also ran tsgo Native Go-based TypeScript preview that shipped before stable 7. 7.0-dev. Median was 4.3s. Stable 7.0.2 matches the preview.

## App build + tests

| Build | Wall clock |
|---|---|
| TS 6.0.2 | 57.5s |
| TypeScript 7.0.2 | 9.0s |

## Upgrade

Bumped the package, reinstalled, re-ran the typecheck. No config changes, no new errors, no code fixes.