Mines somewhat the same, it launches and it's playable but in key fucking moments it'll freeze up for a good second or two and it shits on me, especially mid spray and I come back to looking at the beautiful floor tiles in mirage for a brief second before being dead
task kill it and see if it will start correctly then if not then reinstall csgo if that doesnt work then reinstall steam if that doesn't work then i dont know what to tell you try to do a system restore