Not sure what you're doing with PDF's... I've never had a problem with any PDF under 5MB in size; sure they take a bit to download but that's a bandwidth thing. Not sure what's wrong with your install size, but I'd say get away from version 7, which was fairly slow and move up to 8. My 8.1 install is only 89MB (which is huge compared to foxit, but nothing like the 200Mb you have now), and I seem to remember the 7.0.8 install I had wasn't much bigger than that.

So it certainly seems like your reader has a bit of bloat in it. Kill all versions of it and reinstall.

Isop