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On Windows 10:
Open Resource Manager (see the bottom left corner of Task Manager's Performance tab), switch to Disk, sort by Image. Do you only have a few instances of msmpeng.exe, or dozens/hundreds? Each instance should show what file it's accessing. Are new instances being created/deleted all the time, or is the list pretty much static?
This should at least give you an idea of WTE is keeping it so busy.
(I'm assuming you're talking about the built-in Windows Defender...third-party AV tools might behave differently)...
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dandy72 wrote: third-party AV tools might behave
leap of faith
This internet thing is amazing! Letting people use it: worst idea ever!
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Don't twist my words by excluding a key part. 
I actually wrote they "...might behave differently", not "might behave". Which, you're correct, would absolutely be a leap of faith.
Especially as of late. These days I have no faith whatsoever in third-party AV software making anything better at all.
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Just one process. I did notice something screwy comparing resmon with task manager.
According to the resmon's bytes/sec counter, MsMpEng.exe was writing almost constantly and just doing reads in occasional smaller bursts, task manager shows exactly the opposite pattern. A torrent of reading (32GB in the last 24 hours since reboot) and an occasional burst of writing (320mb total since reboot).
Other than that something screwy is going on - which I already knew - this isn't giving me any more of an idea WTE is wrong.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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Is it constantly writing to the same file? Anything unusual about said file?
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The only thing it's hit continuously for the last 20 minutes has been the NTFS volume log, it's admitted to touching at least 4 other files during that time. OTOH the 2 sets of numbers in resmon don't add up and are much lower than the rate that task managers totals are updating. In the last 75m, according to that it's read 210GB and written 80MB.
https://i.imgur.com/HuntFLY.png
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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I wonder if running chkdsk at the deepest level (if there's still such a thing nowadays) might fix something that Defender is struggling with...admittedly this is pure speculation from my part...and probably as useless as some of the other suggestions you've already come across.
I would also try getting rid of older volume shadow copies - there's no point keeping those around and having Defender scan them (assuming it does) if there's nothing you think you'd ever need to recover. Try this from an admin prompt:
vssadmin delete shadows /all
Maybe with these gone, it'll quiet down Defender.
If it doesn't help...well, that was my best shot so far. I'd be curious to know one way or another if you do find a solution.
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I'll poke those and update when I do, but it'll probably be Sunday at the earliest before I have the time.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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No hurry - it's just morbid curiosity from my part. It's your system that's suffering from it in the meantime. 
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I had this problem under Win7, solution was to just right click on the defender icon on the task bar, find the settings and turn off real time disk/memory scanning.
It still kept a watch on what was in memory, and stopped threats getting in, but it wasn't constantly scanning the hard drive looking for threats.
Not seen it re-occur since I moved to W10 tho.
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The current version doesn't let you permanently disable major components other than the upload to cloud for analysis stuff because lots of enterprise customers would also balk at that. As do I since the only 2 options when it's enabled are "silently upload anything of concern" and "only prompt for things MSE thinks might have sensitive information". There is no "prompt before all uploads" option. If the latter did exist I'd probably enable the feature, but I don't trust any Artificial Idiot to always get things right.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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Ah... 
As I say it was back under Win7 when I used to have those problems.
The only problems I have know is how overzelous the damn thing is.
"I Found a Trojan in your System, OMG, OMG, OMG.... call the police, sound the alarms...", Erm, yea Defender, that trojan happens to be Sony Sound Forge, I re-installed from it's original CD, and I been using it for years..... repeat ad infinatum....
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Peter Shaw wrote: "I Found a Trojan in your System, OMG, OMG, OMG.... call the police, sound the alarms...", Erm, yea Defender, that trojan happens to be Sony Sound Forge, I re-installed from it's original CD, and I been using it for years..... repeat ad infinatum....
I know that feeling. I installed a trial of FSecure this morning did a full system scan, it flagged an apparent old game install as adware. I didn't do anything before leaving for work, will probably feed it to virus total tonight and see what the rest of the world thinks.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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I tend to stay clear of "free" AV products for obvious reasons already discussed.
If you have a good enough reason to buy around 5 licenses, some of the premium security suites can be had for around $5-$8/seat. Even then, you could sell the other licenses you don't need to friends or family. I happen to have that exact number of PC's (5), so I do this every year.
As for software utilizing your CPU cores, it might be helpful to know which CPU you are using. Core over utilization can be a real serious thing, especially if you are running WIN10 on an older CPU.
Best of luck,
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i7-4790k, overclocked to IIRC 4.8 or 5Ghz.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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Lets see... My time is worth $200/hr.
My 3 years of ESET for 6 Computers cost me less than that.
Once setup, when I pay in the future, all computers see the new expiration date.
AND they include the newest version of the software with this fee structure.
It's fast, and if you upgrade early, it extends your expiration date properly (unlike norton).
So... 1hr of time buys me 3 years of piece of mind, on all the computers I need.
I barely ever NOTICE ESET hogging cpu (over a slow VPN, yeah, but EVERY scanner will do this).
Ignoring the time spent "Dealing" with this stuff and the Lost CPU time justify the cost!
PS: In a past life, I went in and cleaned up machines for clients that their employees got infected... And it became so common, that they owner said the employee would absorb my charges when it happened on their computer... Funny how much less I showed up after that. LOL.
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I understand where you're coming from and I'm close to being done. If it was a recurring issue I'd agree completely, but this is one glitch on one machine in 20 or 30 years of aggregate runtime across multiple machines; a rate low enough I'm not going to assume MSE is intrinsically worse than any competition I might switch to. And as a one off anything I learn troubleshooting isn't necessarily a loss in that I'm learning stuff I might be able to reuse later. I've more or less bottomed out there, the ETW log someone had me collect wasn't something I could readily figure out, so I'm down to the point where the turtles are replaced with dragons.
I've currently got a 30d trial of F-Secure running (recommendation from a trusted friend), and will probably upgrade to paid if the situation isn't auto-resolved within a month.
Did you ever see history portrayed as an old man with a wise brow and pulseless heart, weighing all things in the balance of reason?
Is not rather the genius of history like an eternal, imploring maiden, full of fire, with a burning heart and flaming soul, humanly warm and humanly beautiful?
--Zachris Topelius
Training a telescope on one’s own belly button will only reveal lint. You like that? You go right on staring at it. I prefer looking at galaxies.
-- Sarah Hoyt
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Used to love HiJackThis but it seems it's no longer kept up to date. 
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Mixing terms has kept the wheels turning. (8)
modified 2-Aug-18 5:22am.
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HAMSTERS! 
Mixing (anag)
terms has TERMSHAS
kept the wheels turning.
Sent from my Amstrad PC 1640
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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Correct.
Wow, that was quick. Well done.
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It just leapt out at me!
Good clue 
Sent from my Amstrad PC 1640
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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ALERT! ALERT! Hamster escaped! Jumping at innocent bystanders! ALERT! ALERT!
"It is easy to decipher extraterrestrial signals after deciphering Javascript and VB6 themselves.", ISanti[ ^]
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"Danger, Will Robinson, Danger!"
Sent from my Amstrad PC 1640
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!
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Do you use them during your workday? Or are you all digital?
"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge". Stephen Hawking, 1942- 2018
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