Liz, if your email and fb are also slow, it has nothing to do with GU.
I've noticed GU is a bit sluggish lately, so I cleared my cache and browser history down to the bare bones. it worked like a charm. that's often a fix if sites aren't as responsive as they should be (assuming your internet connection is robust). things like cookies and add-ons and such will clutter up your browser's ability to work at cruising speed.
as far as the 10 posts: I saw the same when I logged in with my desktop computer. I assumed there were only 10 since I logged in yesterday, although it seemed a little less than usual. so I can't say whether or not I've experienced this as a glitch or not.