Additional infos:
I’ve attached two gifs which show the problem. The shown journal is loading after some time. But we have journals with even more back issues which timeout on loading the back issues.
Again, while loading, the PHP process is at 100% cpu usage (/out of 800% on an 8-core system). Is PHP limited to one core only?
Why does nobody else have issues with the back-issue page load times?
Demonstration
Demonstartion with Firefox DEV-Console request information
