I'm not sure if it's using your environment correctly, or are you expecting ~150 errors? Lots of import errors, and I'm guessing most of the other ones are errors because it couldn't infer what was imported.
Ty: 2.5 seconds, 1599 diagnostics, almost all of which are false positives
Pyright: 13.6 seconds, 10 errors, all of which are actually real errors
There's plenty of potential here, but Ty's type inference is just not as sophisticated as Pyright's at this time. That's not surprising given it hasn't even been released yet.
Whether Ty will still perform so much faster once all of Pyright's type inference abilities have been matched or implemented - well, that remains to be seen.
Pyright runs on Node, so I would expect it to be a little slower than Ty, but perhaps not by very much, since modern JS engines are already quite fast and perform within a factor of ~2-3x of Rust. That said, I'm rooting for Ty here, since even a 2-3x performance boost would be useful.
uvx mypy . 0.46s user 0.09s system 74% cpu 0.740 total
So ty is about 7x faster - but remember ty is still in development and may not catch the same errors / report false errors, so it's not a fair comparison yet.
Note that `uvx mypy` may give you inaccurate timings on macOS. The antivirus in macOS goes a little crazy the first time it executes a mypyc compiled program.
Adding "time uvx ty check" shows it took: