TidBITS:

OS X 10.10.1 Yosemite has been out for a bit now and while it is working fine for many people, there are still a variety of complaints making the rounds on the Internet. Here then is a collection of five problems and solutions (or at least workarounds) that we’ve either experienced or had reported to us.

Not all of these will be applicable to everyone but some might help speed things up for you.