XDA member Anderdroid, has just released the latest market update in an installable .apk file for everyone. This update only moves up the build slightly from 2.2.6 to 2.2.7. The primary fix in this version pertains to rendering issues that devices with a screen size of 480X800 were having. Which pretty much pertains to all the Galaxy S devices, the Nexus S and a few others.
I installed this update to my Vibrant very easily and it seems to have solve the slow loading times that I previously experienced. Head on over to the xda-developers thread to pick up this update.
Source: xda-developers