I recently had a problem with Firefox on Windows 7 through Parallels 9 / Yosemite. Firefox was incredibly slow, IE and Chrome both super fast. After starting Firefox in Safe Mode, the problem went away.
The solution was to disable hardware acceleration:
https://support.mozilla.org/en-US/k...fix-problems#w_turn-off-hardware-acceleration
Hope this helps anyone else with this issue.
The solution was to disable hardware acceleration:
https://support.mozilla.org/en-US/k...fix-problems#w_turn-off-hardware-acceleration
Hope this helps anyone else with this issue.
