Can you help with custom-css???

Hi,
I run a speed test on my page, and the slowest part of it is this:
http://www.georgezsiga.com/?custom-css=1&csblog=1&cscache=6&csrev=46
and I have no idea what it is, or how to fix it so it could be quicker..
I used this:
http://tools.pingdom.com/fpt/#!/yx8fM/http://www.georgezsiga.com
thanks if you can help any way…
George