Here's a simple fix for loading issues with Battlefield 3 in Origin & Battlelog.

Step 1:
Exit Origin.

Step 2:
Log out of Battlelog. Leave the Battlelog window open tho. Do not close your web browser.

Step 3:
In firefox, click on Firefox > Options > Options > Privacy > Clear Recent History > Clear All History > Everything

Make sure all cookies, site preferences, etc are selected. You may choose to leave form data and passwords if you choose. Click apply.

Step 4:
Log back into Battelog. Select a server from your favorites. Click join server. This will automatically log you into Origin, and take you to the server loading page. This should also allow for a quicker server load as well.