I recently switched from TextMate to Zed because of the lack of LSP support and other modern features. Zed comes closest to a native macOS app of all the editors I tried, but nothing could beat TextMate at that. What did you do to get LSP supported? I might give TextMate another try.

Zed is as close as it gets, I also use it, but it is still slow and cumbersome sometimes.

https://github.com/tectiv3/lsp-client/issues/1