I've compared the final release build (9.40) against 9.37 and I don't see any difference in CPU usage - well, _maybe_ 9.40 uses 1% more, but it's a bit hard to see the exact numbers. Also, I've loaded an old preset and turned all "Dynamic" speeds on, and that also gave about a 1% increase in CPU usage.

What differences are you seeing?

Note: If you've configured it to use a specific core, that is now (by default) a "preferrerd" instead of "forced" core. Meaning that Windows can, if it needs to, move it somewhere else. I've done tests and this turned out to work much better, sometimes Windows starts some background tasks which are also running on a specific core with high priority, and in that case if we force things to run on that same core it needs to wait until the Windows task has finished. You can still force it to run on a specific core though, see the new "Forced" checkboxes under CPU & Latency. Not recommended though!

1. Try run beta 039 and above on 1 core. If you watch Task manager You will see windows spreads it to few other cores. "Forced" does not help, it uses core0, then after few second core4, then 6 then 8, and i set it all to core 15. Beta038, and older betas, are fine. Sure i will not use 1 core, but it is easier to see what's happening.

2. When i use "dynamic speeds" on my 7 MB bands, cpu load rises from 44% to ~68%, on any beta/release. I just found "Start Attack Immidiately" Also uses much CPU.

Weird. "Forced" works fine here, I just verified it on the 9.40 release. If I select core 1 forced for multiple threads and increase the CPU load a lot, it all stays on core 1 and starts to buffer.

I also measured Dynamics on/off for both AGC and all MB1 bands, and it increased the CPU load from 51.5 to 52%, maybe (hard to see with such small numbers). So I don't know what's happening on your pc... Could be a cache issue - is this still an old Core2Duo or Core2Quad system?

No i am on i9 9900K at 5GHz.. and beta 038 works fine all after that does not work with cpu cores how i set.
Checked also on core2duo and i3 9100.. same thing. Also on all same HIGH cpu usage when using "dynamic speeds" on MB bands. One Pc is XP, one W7 and one is W10. Exactly same with this 2 issues.
Maybe i can send you preset i am using ?

edit

Ok Forced seems to work, i didnt check one checkbox. However it worked erlier without any "forced" checkmark.

Yes, please send me your preset.

About "Forced": Without "Forced" it works better. It uses the core that you specify if it's availalbe, if not, it will pick another one instead of just waiting for it to become available. That reduces the change to get dropouts if the pc starts to do other things. That's why we modified the old behavior, you can still force it if you really want to but usually that turns out to be a bad idea.

Eh, you actually changed how that works, ok.

Issue2: Something in preset. Try load web preset '7wonders' and just turn all "dynamic speeds" in MB. Here difference in cpu usage is 59% vs 42%.

And here how it looks on 1 core with dynSpeeds On and off.