So I usually like playing tf2 in big servers (24-32 slots) and today I noticed a huge number difference in my net graph...although i'm not sure what the numbers mean.I will post a screen shot of what I'm talking about. I don't know if this is good or not, but it seems to me that this huge number difference is the cause of my lag and low fps while playing tf2 using vista. Also there are times when I get huge lag spikes my ping goes up to 150 + (usually when I'm near a lot of enemies with them shooting at me) resulting in single digit fps.I didn't have this problem with XP so why do i have it with vista?
here is a screenshot of my system specs according to dxdiag :
