After upgrading to Sitecore 9. We were experiencing poor performance while using the locked items list. Luckily the problem was easily fixed. Here are a few pointer to what were done to optimize performance for this module. First of all we disabled the counter for users number of locked items i the Experience Editor.
This is done with a configuration file like this
<configuration xmlns:patch=“http://www.sitecore.net/xmlconfig/"> <sitecore> <settings> <setting name=“WebEdit.ShowNumberOfLockedItemsOnButton”> <patch:attribute name=“value”>false</patch:attribute> </setting> </settings> </sitecore> </configuration>
Well this does not quite does the job. When using the functionality the rendering of the list is still slow. This can be fixed with this guide Solution 4 is your friend here. :)
Thanks to my dear colleague Daniel for tracking this one down.