Internet connection

I used to use wifi for my connection to the internet, but for the past month or so, my ping has increased from around 200 to spiking amounts between 250 and 500 (in the same server). I switched to using an ethernet cable instead (cat6e). My ping improved to between 230 and 280, but is still not at it's best. What can I possibly do to get back to 200? I know it's not my modem or provider's problem, because the ping on my laptop was 200 and same with my old desktop. I need to fraps some clips soon, so I need to be comfortable with the ping on my gaming desktop. HELP ME OUT PLEASE! ANY QUESTIONS BELOW!