I was wondering if anyone has any advice for changing my computer's settings so Dead Island wouldn't lag. I have a pretty nice new computer, its only downfall being that it doesn't have a graphics card. It does meet all of the other Dead Island requirements though, and for the first few weeks I played it through steam, I had absolutely no problems. Recently, I can't even swing my weapon fast enough to avoid dying. I cleaned out my recycle bin and removed unnecessary files. I even turned all the dead island settings to low. I know without a nice graphics card I wont have the best gameplay, but I'd at least like to play it would lag like I did before! Am I missing something? Do I need to change computer settings or game settings or both in this situation? Any advice?

Here is my system's information: Intel(R) Core(TM) i7-2640M CPU @ 2.80 GHz, 8.00 GB of RAM.