Is this happening on both Wi-Fi and 3G/H/H+?
Download and install, free from the Market, SpeedTest.net:-
https://market.android.com/details?...DEsIm9yZy56d2Fub28uYW5kcm9pZC5zcGVlZHRlc3QiXQ..
and run this with Wi-Fi activated and take a note of your download speed. Then run it with Wi-Fi de-activated, (so you are using 3G/H/H+), and take a note of your download speed, , (or even better, take a screenshot of each and post them here).
Then post your results here.