Image Cleanup Causing performance issues

It seems here recently that when Image Cleanup jobs run all of my backup jobs freeze until it is done.  This is causing my backups to either sit active for a very long time or fail all together.

the appliance is a 5200 running 2.5.1.  i just recently upgraded some clients and the master to 7.5.0.6 but this seemed to start happening prior to the upgrade. 

I did adjust some retentions to a lower time frame about a month ago.  Could this be causing the issue?

Cleanup jobs runn all throughout the day and night and some run fine while others will run for an hour or so.