Any of the Star Trek trailers will do as fine examples. Plays 480p just fine, but at 720p and up the video gets too choppy to watch.\Which files? Are these things online you can point me to?
Not on my system, it doesn't. And mine has a slower microprocessor than yours.
Keep in mind that Bolio is running Windows; for many years, Apple's development of QuickTime and iTunes for the Windows environment has lagged far behind its Mac OS work. It wasn't until recent versions that the Windows form of iTunes was really usable, for heaven's sake.