Minor speed regression (13%) and 'choppy' performance in 3.4 vs 3.2

OS is Win2012R2.

When comparing my workload on the 3.4rc1 vs 3.2.10 there is a minor speed regression (13%) which appears to be mainly due to some intermittent activity (eviction?).

I see the cpu spike to 100% every ~10-20 seconds with a corresponding speed drop. In 3.2, the cpu stays relatively flat.

This is minor but thought you might like to know.