It's an extremely broad question, in what way do the games lag, are you getting bad FPS or are you getting high latency?
If it's an FPS it could be that your computer specifications need upgrading, I.E you need a new GPU and/or CPU - but if it's your network latency then that could be router issues, ISP issues, location of the data centre that you are connecting to etc.
If you give us an example of the problem, what game it is and the specifications of your computer I may be able to help further. Also could you do a speed test and paste your results in here.
|