Updating the history can take a very long time when there are a lot of objects

Saving a document with 10000 xobject can easily take 30s and most of it is spent updating the history, and more precisely creating the diff (see XWIKI-21680).

One idea from MichaelHamann would be to simply stop storing diffs, that would make history update/loading a lot faster and simpler and might not take more space if stored compressed. It would also help get rid of the long dead JRCS eventually.

Setting "xwiki.store.rcs.nodesPerFull" property to 1 in xwiki.cfg might help as it tells XWiki that each version should be a complete version, so it will never try to create a diff. However it means the history will take much more room in the database, but never more than 5 times the current room (since the default is to store a complete diff every 5 version currently).