My sister upgraded her 2011 MacBook Pro 15" to Yosemite from Mavericks. As far as I have been able to glean the upgrade went without a hitch, but now her computer is mostly unusable. It is very slow, to navigate about the finder, slow to open programs, and largely unhappy. She has over 100GB of free disk space and has 4 GB of RAM. Any ideas about what went sideways?
The safari crashdump is too long to post here, so I have posted it on Dropbox: https://dl.dropboxusercontent.com/u/9371124/safari_crash_dump.txt