I optimized my network to reduce ping, not sure it will works on delay or lag or not, I used until now so far no lag, I kinda forgotten what I had done, as far as I know I use TCPOptimizer, a few tweaks on registry and restart, it should work well.

Streamyx speed: 4M

Before implementation: 60ms - 200ms

After implementation: 30ms - 150ms

Works well with XP, Window 7 not yet tested.