Has this been a problem with prior versions of Chrome?
I’m on 54.0.2840.100 and it seems to be hovering around 180M (only 2 correspondence games going though). It balloons out to almost 230M, but after a minute or two the garbage collector brings it back down.
Can you try reproducing this in an incognito tab? (ctrl-shift-n will open one up) - if it doesn’t happen there then it’s most likely an extension causing the problem, otherwise it’s either chrome or us (neither would surprise me, though we haven’t updated the production site in over a month so if it’s just a recent thing, it might be chrome)