[Meta] Frontend Performance

Frontend Performance

• Large issue performance (#23207 (closed))
• Load Participants via Ajax (#23206 (closed)) WIP @lbennett (ready and waiting for backend)
• Load award emoji 1 time per page (#23226 (moved)) WIP @fatihacet
• Autocomplete is not performant (#18435 (closed)) Closed
• Load toolbar 1 time per page (#23227 (closed)) Closed
• Remove jQuery UI (#18437 (closed))
• Loading large diffs (#14775 (moved))
• Emoji Popup Loading Performance #22474 (closed)