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Have you tried the new native compilation system? I haven't worked on LaTeX documents specifically, but I did see a noticeable improvement in responsiveness across the board and a massive improvement in Elisp-heavy functionality like org-agenda.

I've used it on both Linux and macOS; for whatever reason, my Emacs has always been snappier on my Linux machine, and that's still true with native compilation, but now the macOS experience is also pretty solid.

Have you tried profiling? It's working fine with me on both Windows (without WSL) and Linux.

Even without your init file (`emacs -Q`)? Or try profiling (M-x profiler-start, pick cpu, do stuff, then M-x profiler-report) to see if any third party package is involved or not