I upgraded to the new global update yesterday and since then, my Wi-Fi speeds have been atrocious. On a Wireless N connection, I went from 54Mbps to 5Mbps on the same connection. If I turn Bluetooth off, my Wi-Fi speeds go up to 13Mbps. This happened both at work and at home, so it's not the router.
Anyone else notice this? You can verify your link speed by going into your Settings, click Wi-Fi, then click on the wireless network you are connected to; it will then show you your Link Speed.