Main-thread health (#6957): long-animation-frame (LoAF) and longtask
entries, kept in a bounded log and summarised per load window. Both entry
types are feature-detected; an engine without them reports supported: false and empty stats rather than zeros that look like a healthy load.
Main-thread health (#6957):
long-animation-frame(LoAF) andlongtaskentries, kept in a bounded log and summarised per load window. Both entry types are feature-detected; an engine without them reportssupported: falseand empty stats rather than zeros that look like a healthy load.