question on UI's

[SiNiStEr_NaTiOn]

I know when using the default UI i don't encounter to much lag, but using a custom UI that is a different story. I'm wondering why a custom UI I had to deal with to much lag while the default UI I don't encounter that much lag.

There are people i Know prefer the default over custom because of lag issue's. So if this is the case then why do custom UI's would cause this lag problem.

I know some area's is naturally laggy even with default like terran grasp for some reason.

Back to the topic. Most of the time i would get lag killed with custom and with default I won't.

If your gonna say use the default, I'm gonna say is the default is fine, but don't like the look and feel of the default.