http://steamproxy.net/games/487120/announcements/detail/1438189897681053213

With the new patch there are new monsters, balancing & bug fixes and a shored up backend! You should encounter a much better performance on high populated servers.

If you still got crashes join the community discord or mail your crash dumps to blue isles studios.

Here's how to:
1) Go to C:\Users\<USERNAME>\AppData\Local\Citadel\Saved\Logs
2) Zip the most recent folder in Logs.
3) Send to support@blueislestudios.com with as much detail about what you were doing before and during the crash, as well as the build number
(number in the top left corner of the main menu)

For AMD users:

They are aware of performance issues. Try to update to the lastest driver and check for performance mode in your radeon settings.
Download the newest AMD drivers here: http://support.amd.com/en-us/download