From the Official LOTRO Forums:

Additionally this weekend we will be placing Update 18 on Bullroarer for it’s first Open Beta session. In this build we will have much of the content going out with U18 but it will also have the following items we hope will improve performance in various areas:

– Awesonium upgrade to fix the store crashes some folks are seeing

– Login Server fix to the “Server Full” error

– New graphics setting options for reducing graphics and client load in PvMP areas

– Reducing the data footprint of the Minas Tirith and Pelennor areas

More details and patch notes to come towards the end of the week.

We hope that you will have a chance to jump in and help test these things out with us and keep providing your feedback here and in /bug. We are reading all of it, even when we can not respond. Your feedback makes a difference!

Thank you,

Vyvyanne