This had actually been the case since mid January. I log into Star Legends and while everything runs, it runs at roughly half speed. Everything is unplayably slow and there's massive lag even in the title screen.
Yes I've gone back and turned off all flags. I've rolled back to the stable version of Chrome OS. Clearing Cache now on the off chance pre-flag reset client pack is futzing with things but somehow I doubt it. Also I've tried going into the process list and nuking Everything not needed to run the game itself (zedt, scratchpad, google play, adblock, all of it.)
Running on CR48, which may be the problem here.