*EDIT* I should really browse a bit before i start replying randomly...
http://forums.androidcentral.com/virgin-mobile-optimus-v/150421-data-throttling-starts-3-23-a.html http://forums.androidcentral.com/virgin-mobile-optimus-v/150421-data-throttling-starts-3-23-a.html
Yes i have seen a difference also. Can't tell ya speed differences, but i know its much slower. I also don't have internet at home, and use my OV for my desktop. I didn't think it was a lot of usage, but i wanted to see so i downloaded an app to track my usage. One month with normal internet usage for me ate up 40+GB. I figured it was because of this that i saw my speeds going down.
Until I got one of their text messages today stating that beginning .....crap i forgot the date....i think march, but may have been February third.
Anyway it said that you may see a decrease in data speeds if your usage goes over 2.5GB.
Now, that date is not here, but i would think they would be testing the code out before fully implementing that policy.
I don't know what your usage is like, but i'm pretty sure MY account would be a good account to "test" the new code on.
Just a stab in the dark