Question about grabbing feeds

Hi all,

I was building an application for grabbing feeds from various
But sometimes when I run the app, I found that there would be
“Execution Time Error.”
I think this is due to my having too many feeds to collect at a time.
I tried to modified the app to grab those feeds with ajax (no page
refresh), but the error still popped up once in a while.
So I was wondering if I did the wrong thing for handling this problem?
Any suggestions on this issue?

Any response is appreciated. Thanks a lot!