Does a highly performant XLSX tool exist? I want to be able to open a 500k row, 60+ column table in Excel and manipulate it at 60+ FPS. Zero lag. I feel like Excel has never - ahem - excelled in this department. Libreoffice comes close and I enjoy it on Linux, but on my M2 Macbook Air it struggles.

Try https://rowzero.com ? We have written a much faster spreadsheet engine and regularly work with 10M+ row datasets