If you have one of the mini's with 2GB of memory, a number of people have Lion found performance lacking, which was fixed by going to 4GB.
How much free disk space do you have? If your hard drive is filling up, that could cause peformance issues.
Bring up Activity Monitor (on your hard drive in Applications/Utilities) and see if any program(s) is running 30% to 50% or more of the CPU. If not, reset the SMC:
- Shut down the computer.
- Unplug the computer's power cord.
- Wait fifteen seconds.
- Attach the computer's power cord.
- Wait five seconds, then press the power button to turn on the computer.
See this FAQ for other ideas: http://www.thexlab.com/faqs/performance.html
I vote for full disk, 2GB of Ram should be enough, although more is preferably.
Start Activity Monitor: click the "disk usage" button at the bottom, and give us the data. Then click the "System Memory" button, and give the values of "free" and "inactive"; then click the "Disk Usage" button, and give us us the "data read" and "data written" values.
2 GB of ram is not enough to do any kind of work at all. Do you hae the i5 or i7 MINI? I would think about the ram upgrade as well as an SSD for the machine. I have a 2.0 Ghz i7 with 16GB of Ram and 2 Crucial SSD drives and the performance is AMAZING! Worth the upgrade! If you don't go or the 16Gb then at least do the 8Gb but you will kick yourself later down the road. I have 4Gb now just sitting in a drawer, if you want it you can have it.
I got the ram from NewEgg and it was way less than OWC.
The MINI was way faster than my last computer and that alone was a great performance boost but with the prices on upgrades where they are it was dumb to not do it and live with a not as fast machine until I got around to upgrading.