PivotX 2.1.0 beta 3.
There was an annoying bug in the previous beta, that could severely affect performance on entrypages. This bug, and a few other issues, have been fixed in PivotX 2.1.0 beta 3. We recommend this update to all current users of the 2.1.0 betas.
The beta version can be downloaded from this location: pivotx.net/files/pivotx_210b3.zip (or pivotx.net/files/pivotx_210b3.tgz, if you prefer .tgz files). For setup instructions, I point you to our documentation: Getting the files & installing.

do you have a release note to check what buggs where fixed?
How do I install the update without losing my entries and modified templates? I can’t find the instructions (only about upgrading form 1.x)
Please read the documentation before upgrading to PivotX 2
http://book.pivotx.net/index.php?page=4-..
@ peter, thanks, but i have version 2.1.0 beta 1. Is the upgrade instruction the same?
@roeland: yes, exactly the same.