That's interesting that firefox still has that RAM leak. In my last very small linux system this site ran very well in chromium but chromium itself was also leaking ram or my system was making too much cache or thumbnails or SOMETHING as it would get super slow after 24 hours til it inevitably froze or crashed. Not really to do with chess.com though. I'm constantly amazed by how little resources chess.com is using for how many things it does so beautifully.
I still can't understand why I have almost no lag in New Zealand with only 40mb/s down and 4 up, and so many other people here have so many issues.
How come you don't use linux btw? I mean it's great that you're testing but you seem to have skill with pcs.
So, lately I have so much problems with network lag, even I can't measure it by any means, it should not be present at all.
I have 0% packets loss, average ping time is 180ms which is fine considering it goes over atlantic ocean . . .
The problem I see so far is that live chess applet is not aware of short connection losses, which could be caused by either side. I even tried running ping with -t argument to clue out when these problems occur but no luck.
Just now finished one bullet game with premoved opening, and I watched clock assigning me 3.2 seconds to premoved Bd3 . . . I usually premove up to Qe1 in this opening:
https://www.chess.com/live/game/3473208781
This is "invisible" problem because there is no indication that connection was lost, and I captured by mere chance right now.
I even tried recording my bullet games to find out when these connection losses occur, but there was no problems that day so I abandoned the idea.
When there is no such problems on my side, my rating goes up to 1850, when these troubles start my rating can go down to 1450. This is very frustrating !
Next thing, not less important and possibly related, when playing from Firefox, it loads 4 engine instances, and as longer You play larger the RAM footprint. It starts from ~200MB and grows up to few GB-s of course with decaying performance and it chokes whole Windows at some point.
I switched to Chrome and those problems vanished, but undetectable connection losses remain.