From the AA3 FORUMS
restart steam to get update

Attention Soldiers!

Now available via Steam and the Deploy Client is a patch to greatly improve performance of AA3. This patch addresses the following issues:

• Removed apparent lag caused by other players entering or leaving a server.
• Resolved many start of round spawn issues.
• Resolved problem with training results not saving.
• Improved communication with Authentication server.
• Resolved freezing up when moving from one training mission to another.
• Cleared up hesitation during training missions
• Significantly reduce number of authentication transactions between player and Authentication server.
• Resolved achievements save and display problems.
• Improved login communication with Authentication server
• Improved player statistics tracking for better accuracy
• Improved overall performance.

Get the patch now! See you on the battlefield.

w00t - hopefully we see AA patches about as frequently as tf2 patches, that way all the big issues should get fixed pretty quickly.