(1) Download the program from the link provided, install and run it!
(2) This will give you a log containing all your system specs......post those details here.
(3) Call up your Internet Service Provider (or check your account details online at their website) and request details of your internet connection account relating to connection speed. (ie 256kb/s - 512kb/s - 1.5mb/s - 3mb/s or more). Tell us what this is.
(4) Im sure you remember which game you were playing when you suffered the lag. Tell us what it is.
Remember that gaming requires large reserves of computer and bandwidth resources, so in short, your probably trying to do to much with too little!
Regards