Unity 400f all flash and Compression

I am new to my current environment and recently went through a 48 hour sev 1 issues in regards to the SP utilization.

During the SP failover event my single SP was unable to handle the load that was spread across 2 processors.  During the SP event I saw I/O load around 100,000 steady and spikes up to 150,000 s

Steps I took to lower SP utilization:

I disabled compression across all LUNs. 

I have a RecoverPoint Cluster in my environment and my Unity is a RecoverPoint Target and I identified 1 particular LUN was receiving high amount of write I/O.  I Discovered RPA was NOT using compression nor deduplication between site replication.  I enabled Low compression and checked de-duplication thinking that this would reduce write I/O to the Unity and help lower SP utilization.

Within 16 hours of making these 2 changes the SP was successfully replaced and following the event:

Drive load dropped to 18k-25k steady from its previous 100k-150k.  The 100-150k load was present before hardware failure

CPU utilization dropped to 20-30% for both SP's.

My question:

When compression is turned on for a LUN I expect the SP utilization to increase but does it generate I/O as well?   I am trying to understand what impact compression has on my Unity system. 

I do suspect that enabling compression and Deduplication on my RPA helped.  To confirm, I have disabled Dedup and Compression and I am monitoring the results..

Thanks,

Mike