You're sure that this is not your PC's fault? Works flawlessly here.
There is the "Installed" filter already? And as you can edit the style file it perhaps is possible to modify it to your needs... dunno how this will react on updates.

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SaintK: I'm completely lost

Scrolling pages is really slow. In both Safari and Chrome I do not have these issues and they both use the Webkit rendering engine. These are probably performance issues which they will fix, but for now if this implementation keeps "as is" then it bothers me.
The issue I have is that the default setup it only has a merely change in grey when viewing lists.

I know there is an "Installed" filter and I know I can create my own categories, I just dislike the fact that the difference between installed and uninstalled games is just a slightly lighter gray.

It would be nice to have a setup as with the current including categories.

-> Keep current category Filter layout.
-> Incorporate within the categories the old "Favorites/Installed/Uninstalled" list.

For example: If I were to have 1 shooters, I can assign them to the Shooters category. I then select this category and Will see something like this:

- (Favorites)
Game A
Game B

- (Installed)
Game C
Game D

- (Un-installed)
Game E
etc...

See what I mean, have the current categories, but incorporate this listing filter within the category.
Saves you from dragging games around categories and looking and although I still have a small list with just 20 - 30 games, I see real benefits when having a lot of them.

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"Why do it simple, when there is a hard way..."