Did you upgrade to v10 of Flash Player and now your browser runs really slow especially when trying to play any sort of flash video?

If so then maybe you should downgrade to v9. I run an older G4 Powerbook and was running into this issue until a friend of mine emailed me a few files to downgrade my flash player to v9. Now my browser runs much nicer.

Here are the files:
Flash Player Uninstaller OSX

Flash Player v9 Files OSX

Run the uninstaller, then copy the two files in the flashplayer9r159 disk image to /Library/Internet Plug-Ins/

That’s all. I hope this helps!