Cache problem

Hello,

This plugin is a lifesaver, thanks a lot for creating it!

I have a problem with cache. I have feeds on page from 8 different sources and cache time has been set to 60mins. When loading the page it always takes like 10sec to load.

Any ideas whats wrong?

http://ww.wp.xz.cn/extend/plugins/wp-rss-multi-importer/