Are you on wireless internet connection and experience random lag spikes during gameplay?
Download and run this before playing CSS for lag-free CSS experience!
Extract files
Start WLAN Optimizer.exe
Disable Background scan
if that doesn't help, enable Streaming mode
This is for Windows 7! It also works with Windows Vista
There is similar program for Vista, please check resources section.
Win7 Anti-Lag 2014-04-02
Wireless internet connection and experience random lag spikes during gameplay?