I apologize for the delay getting back to you. We are temporarily overloaded in support this week.
I'm not sure I understand what I'm looking at in your screen shot. Sure I realize it's a graph showing disk activity over a 55 minute period. However I don't know what to correlate it too... what action was happening at what point in time.
As for seeing high IOPS and CPU usage, unfortunately that is believable. The current DB schema is poorly designed and does cause excessive SQL resource use.
The good news is that this part of the product is actively in the process of being redesigned by our development team. We expect to have a new release with optimized DB storage sometime this year.
In the meantime have you already read and tried the suggestions from this KB article