Update docs/guide/performance.md

Co-authored-by: Pascal Jufer <pascal-jufer@bluewin.ch>

docs/guide/performance.md

@@ -30,7 +30,7 @@ export default defineConfig({
 :::
 
 ::: note
-If you are using `vmThreads` pool, you cannot disable isolation. Use `theads` pool instead to improve your tests performance.
+If you are using `vmThreads` pool, you cannot disable isolation. Use `threads` pool instead to improve your tests performance.
 :::
 
 For some projects, it might also be desirable to disable parallelism to improve startup time. To do that, provide `--no-file-parallelism` flag to the CLI or set [`test.fileParallelism`](/config#fileParallelism) property in the config to `false`.