max cpu frequency on idle

[saltfish]

Since upgrading to windows 10 (clean install) my cpu (2600k) seems to spend a lot more time turboboosted to maximum frequency - when just web-browsing or idle.
I've looked in resource manager and it shows overall maximum frequency averaging around 48% to 80% but I can't find any single process thats using up a high % of cpu usage - The only thing is NT kernel using a lot of threads - but I guess that's normal? Is this just windows 10 being inefficient or have I overlooked something?

 

[saltfish]

cpu-z reads same as core-temp - frequency jumps up to max at least half the time on idle and web browsing
- but Ive just noticed something; it seems to calm down after about 40 minutes - what's going on ? Windows 7 didn't behave like this if I remember rightly

 

[saltfish]

I'm on balanced power scheme - but I think I've found the culprit: mozilla firefox,anyone else getting this?