I cant explain anything except for that:
Wireless+Laptop+Multiple Applications+Gaming /=/ Good
If you want to lose the lag and in game horror, your going to need to lose the wireless. Wireless systems can be finiky and tend to drop out. Try plugging straight up to the router, and make sure your BIOS can actually handle the processor you put in it.
In my experience, I stay away from "Upgrading" laptops because they typically cant handle the newer processors.
What did you have in it previously?
Remember when you Upgrade, that you are going to Tax system resources by adding yet another bottleneck.
If you upgrade your CPU, your gonna need to upgrade your RAM, and your Graphics.. etc, otherwise you will not notice the performance increase from the processor. But heres the big part. Oftentimes, the Motherboard is the BIGGEST bottleneck.
In order for us to really help you out.. your gonna need to post your old setup, along with your new setup. Find your motherboard information along with the Northbridge Identification and know all your bus speeds and whatnot.
Without any information, We cant research into your problem.
Also, did you research what your board could handle before you put this new proc in?