1) Intel(R) Celeron(R) D CPU 3.06GHz,, 1GB RAM, Nvidia 7300GT (my main system)

2) Athlon 64 X2 5200, 2GB RAM, Radeon HD 3650 PCI-e, Windows XP (my better half's computer)

3) Pentium Dual Core ~ 2.6GHz, 3GB RAM, intel graphics, Windows XP (work PC)

None of which are particularly "high end", I'll be the first to admit.

On all of these scrolling isn't smooth at the .org and other vbulletin 4.x forums when using Firefox. Scrolling is smooth as anything on vb 3.x and other types of forums.

Scrolling is much better and smoother on vb 4.x sites when using Opera or Chromium - which is my workaround.

As I said above there is a huge difference when scrolling within a thread as opposed to the main index as the rounded corners and shadows are turned off.

It's up to the .org admins if they want to do anything about it - I'm just trying to help. You shouldn't need a high end hex core gaming rig just to browse a forum. £0.02