Not an uncommon problem... there are various opinions as to the reason for it, personally i think it's v3.
Staff will generally advise to try clearing cache, cookies, browser history and all that kind of thing, but this doesn't work for most.
These two groups are admined by the site owner, he wants to hear about peoples problems with v3, it might be worth you joining one or both...
https://www.chess.com/club/chess-com-v2
https://www.chess.com/club/chess-com-beta
All 3 browsers I try using (i.e. Google Chrome, Firefox, and Internet Explorer) to play Game in 5/5 are basically slowing down greatly and essentially freezing up in the last 1-2 minutes on my game clock. What us with this??
I understand you can improve your browser "connections" with the site? How might I do that please?
Thanks in advance for your help.