MS 3.4 increased cpu temp and fan issues

I ve tested this out using Istats monitoring app and 3.4 is using way more cpu and generating more heat than previous version using identical concerts.

Its unusable in a live performance for me at present so have time machined back to previous version.

My MBP fan doesn't even kick in with the previous version even with quite large concerts with 8 channel playback and multiple Kontatkt libraries open.

3.4 sets my fan going just with even very lightweight concerts!

Whats going on?

I think the new version is having multi threading issues?