Refresh rate:
Unless you have a very exotic monitor, you should be able to google this.
Just look for your manufacturer's site.
Performance:
FC5 actually runs faster for me than FC4.
See what processes you're running and disable what you don't need.
As for package management:
Yum is horribly slow, both APT4RPM and SMART are faster (and IMHO also better in handling dependencies)
Video drivers:
This is mostly needed for 3D acceleration.
If you're using nVidia or ATI you can safely install them using RPMs:
http://stanton-finley.net/fedora_cor...es.html#nVidia