I think personally, nothing can be done until Valve releases another Steam update for the game to fix these sorts of problems. Even I sometimes get this problem myself, sometimes it just crashes when I start up and it stays frozen on the loading screen. And its so annoying to do the hard reboot since ctrl-alt-del doesnt work.
If you want, maybe you could try reinstalling certain drivers like graphics, sound or even waste the 45mins+ time to reinstall the stupid game. I seomtimes still get the stutter gameplay myself and even with the recent update and some may command line prefixes, nothing still helps. So its just a matter to see if Valve can really sort it out.