Not worried, just curious: I'm currently running Handbrake 1.10 on my new Dell Inspiron 3576 with Bionic 18.04, and I see that all cores are working nice and hard. :) However, with all 8 virtual cores going (it's an I5 with 4 physical and 8 virtual cores) I see that all cores have pretty much the same load (which is as it should be) but the load of each core doesn't exceed 90% (give or take a few tenth of a percent). On occasion I have seen a single core max out to 100% for a number of seconds (not unusual) but now that all 8 cores are equally engaged, the load appears to be subject to a 90% limit.
Is this by design? If so, would that be a Linux feature, a Handbrake feature, or a property of the hardware?
It makes sense not to max out all cores completely (both in terms of keeping the system responsive and not frying the hardware) but I haven't seen this yet (not having run this version of Ubuntu and not having had recent and decent hardware until now) so I'm wondering what it is that I'm seeing here.