Speaking of lags. Weird thing is, that if I run the dowloadable version of the game and Google Chrome in the background, the game runs okay-ish (sometimes the camera does sharp turns, like, 180+ when I try to just move the crosshair for like 15-60 degrees, but most of tehtime it's still playable, and I can walk normally), but if I run the game in Google Chrome, I can barely play (mouse look is barely predictable at all, if I try to walk - especially, diagonally - the character keeps walking in that direction for much longer than I hold the movement key (sometimes for up to 20-30 seconds) and refuses to move the camera, shoot, change weapon action etc. (it's not with your game specifically, but with any "CPU-heavy" FPS game older than 2000 or so). That's why I'm prioritizing teh downloadable version, ad only play Web version for quick tests if the dowloadable version is not up to date with Web version.
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No, it's not specifically your game's problem, it's my very outdated hardware problem.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.