Glitter Rain

I use Imprudence viewer only, because it has the least lag for me. I can't use Phoenix because everything is all greyed out and the lag is horrible for me. I'm on a laptop. My laptop is fairly new. Only one year old. I purchased it with the best graphics card Dell computers sells. It's frustrating to hear people on laptops that paid $400 for it when I paid almost $5K and have terrible lag most all the time! What causes this? Thanks all :D