No, it's not specifically your game's problem, it's my very outdated hardware problem. Only question is why a standalone game + Google Chrome gives less CPU load (or whatever) than a web-wersion of the game, running in Google Chrome. As for the FPS - it doesn't have anything with FPS. FPS can be high (80+) but input (especially mouse input) is blocked and KB input gets "jammed". I guess my aged Celeron CPU just can't handle so much input at once and puts it into some "queue", then reads from it.