You shouldn't experience a slow loading time from the page cache creation with that many tabs. I would expect it to take less than a second to build the page index.
If you're experience slow loading, I would investigate other causes. You can revert to the standard provider and see if that helps with speeding up the load time. If it does, I would do a http trace at the site startup to see if you're getting things like unwanted 301 redirect loops or anything like that, which would make it appear as though the load time is slow.
-Bruce