The longer my game runs the more frames it drops and starts stuttering. After 45 minutes of playing it became unplayable. I've started with 80-100 FPS with drops to around 50-60 and by the end of the hour it went down to 40-50 average and drops to single digits.
Also I have no idea why but it takes over a minute at the begining of the round to load the model and texture of the weapons I'm using. I have the game installed on an SSD.