I made several minor improvements to Aura that improved the skin graphically and performance-wise:

The most notable change is the background. It isn't fixed anymore, so the lag is gone, even for Firefox users.

The .tablepad and .forminput backgrounds have also undergone the same change, fixing a Firefox problem.

The background and maintitle also have a cleaner look now, due to my decision to get rid of the previous texture.

There are also new topic reply buttons.

Finally, I edited the CSS to remove the default Invisionfree submenu images.