If you start playing it will "close" the launcher, but actually its still running in your processes, and in this time it builds up a crazy amount of memory usage, I keep lagging out because the launcher is using insane amounts of memory usage without me even knowing its there, it appears to be closed and there is nothing in the tray in bottom right.
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kumasasa
Please attach the complete output of the "Development console" of the launcher. CTRL-A, CTRL-C there, CTRL-V in the ticket.
Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.
It seems its just the console of it filling up and causing major lag (I cannot even see it, It should close it self but only hides) the launcher needs something to limit number of lines of history because its causing a lot of performance problems having a lot of lines.