After reading 7 pages, the sheer stupidity of people never ceases to amaze me.
No, it will not make your 3G run better. It's old hardware that shouldn't even be supported anyways. To expect it to run a new OS well is just naive, no, just stupid.
Considering that the problems I see on the 3G are indicative of a memory leak (phone runs OK after reboot but starts to have app crashes and slow downs after a few days), it is something which could be fixed with an update. Will it with this release, I don't know. It takes a some time to see all of the symptoms. Also, Apple doesn't always list every single change in a release, only the highlights.
Be careful calling something stupid unless you are sure you understand the issues involved.