4 ms·

$20 says it's a race condition being caused by multithreaded access to a nonatomic auto incrementing ID...

• ben0x539 13y ago
  Hm, I thought asm.js didn't expose shared memory (yet(?)).
  • sp332 13y ago
    More likely in a back-end database.
    • ben0x539 13y ago
      Duh. Good point.