I believe Apple silicon has Jira coprocessor. It really became usable on M1 and beyond. Even the horrid UX got somehow better in the last few years (like not having 3+ different text inputs, each with different formatting behavior). My guess is since the hardware caught up with them they can now finally use it and iterate.
You jest, but I tested this and it turns out that it was JavaScript, not slow networking, that made Jira so slow for me. (I was trying to figure out how to locally cache assets to speed it up.)
The M-series single-core speeds were so much faster than Intel at the time that it was noticeably faster.
