Well with Tiger running for a few days – it seems to slowly get faster and faster – I know Spotlight took nearly 45 minutes to index the drive (go updatedb+grep!) but the first day it did seem a tad slow, but people have been marking on various forums and discussion groups a slew of issues – I happily report none, but I do note going to beta or newest releases of most Mac apps is a must, upgrading AdiumX definately sped it up and improved performance a bit – on the FireFox, clearing cache and history helped a lot as well – not sure why – but there’s always the new Safari or Camino to choose from so pick and feel 
But all in all over the last few days with increased use on the mac it has seemed to get faster, boot times seem to be leveling out, iPhoto 2 Loads a lot quicker now and the Movie management – frickin awesome! I always hated I had to grab the photos, then browse and grab the movies by hand, now I will become a movie junkie using my cameras 
But overallone thing I will highly suggest if you are going the upgrade method is to use the Disk Utility and do Repair Permissions – definately fixes something as after that and a reboot – much better. If you are a periodic user – aka your Mac is not online 24/7 something I found that helps and keeps your Mac running clean and fast run these commands from Terminal:
sudo periodic daily
sudo periodic weekly
sudo periodic monthly
Run them now and again ever week or two and it helps to run the scripts which normally run on a PC 24/7 to keep it clean and happy – similar to a linux box with CRON to schedule log rotation and restarting of services – definately worth a try – who knows save you a few CPU cycles
More soon!
