For some reason my CS source runs very very slow. When I run the stress test, it said it was running 48 FPS and the second time I tried, it said it ran 28 FSP. When I join or make a game however, it runs very slow and laggy. I know its not my internet connection cause it says my latency is about 50. I also dont think its my system requirements because everything seems to be better than the minimum requirements to run the game. Can some please tell me how to get the game to run faster???

Here are my computer specs:
Intel(R) Pentium(R) M processor 1400MHz, 1.40 GHz, 1.24 GB of RAM
my graphics card is 64

thank you!