Since upgrading to Confluence 7, my Confluence has been really slow.

And a lot of GC warning about it taking longer than 2000 ms...

So, I eventually stopped confluence, deleted the index and journal on disk according to

https://confluence.atlassian.com/confkb/how-to-rebuild-the-content-indexes-from-scratch-on-confluence-server-110035351.html

and the result on response time was "craaazy"....