After update 0.8.3, which took incredibly long time to install, the client installed also "Microsoft Visual C++ 2015 Redistributable" for both 64b and 32b.
The framerate then dropped from some standard (about 60) to average 10fps, changing graphics to Low did not help, neither did running 32b, nor 32b solo without gamecenter, nor uninstalling MS Visual C++.
I have noticed that 64b client took about 2,4 GB RAM (1.9 GB for 32b) - in comparison, 1GB is enough for WoT running with High graphics settings.
When launching game from GameCenter, there are two processes WargamingErrorMonitor. One if launched solo.
I'm looking forward for next fix.