I'm curious about the download speeds as well. Whichever rom I've used the max download speed I've been able to achieve has been 2up, 1down. I've even edited the build prop and played around with it for a day, didn't see any significant changes.
Rebooted the phone twice after making the changes, etc..... question is, did i need to leave the changes for a day or two or even more to see if it actually helped?
On the other hand I have a couple of friends that work installing the towers (or whatever you call those things that gives us data) - in a nutshell, they say that the download speeds is hardware related and not software (they know nothing of rooting phones).... that kinda confused me more than my usually state of mind.
Sent from a dream.