pre-moves are slower on chess.com, they take off a minimum time each turn. If you hold and drop the piece as soon as they move, you can get more moves than via pre-move.
Faulty Timer???

I don't know the answer but my instinct tells me that both clocks are EXACTLY the same. Any difference is just a perception issue due to lag between the two computers.
If you search the forum you will find countless posts similar to yours.

I don't know the answer but my instinct tells me that both clocks are EXACTLY the same. Any difference is just a perception issue due to lag between the two computers.
If you search the forum you will find countless posts similar to yours.
You're probably right. Since this post, however, I did start using FireFox for chess.com only.
Can someone explain to me why if I'm moving as fast or faster than my opponent in a 1 min game, how my time seems to click off faster????? My time will show .5 his will show .2 but mine goes to 0 after I move!!! I played a game where virtually all the moves I made were "pre" moves and still lost the game by .4 seconds...how is that possible!!!