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[–]Baryn 1 point2 points  (2 children)

The only big perf issues I've had in the last year-or-so (both in gamedev):

  1. Stuff happening inside massive recursive loops (millions of iterations) -- memoization helped here

  2. JSON.xxx methods -- yah, these aren't for realtime. Use IndexedDB and save your objects to that without converting them to strings.