Reset your network settings on your iPhone. Reboot your WiFi router.
I did this a little while ago, and am seeing my speeds again. Hope it lasts. Thanks.
Try this guys!
Reset your network settings on your iPhone. Reboot your WiFi router.
Check those apple links I posted earlier. You'll have to sign in with your apple id on at least one of them, maybe both.
I too saw a huge slow down in wifi speeds compared to 3G a few days ago but everything is good today. I may have rebooted the phone between now and then, don't remember.