You are using Edge, which is well-known for such problems.
I list below the usual advice that is given by Microsoft for such complaints,
although do not expect miracles.
Clear browsing history
In Microsoft Edge, select Hub > History > Clear all history.
Select Browsing history and Cached data and files, and then select Clear.
Clear all browsing data
In Microsoft Edge, select Hub > History > Clear all history.
Select all the boxes, and then select Clear.
Repair or reset Microsoft Edge
Repairing the browser won't affect anything, but resetting will remove history, cookies, and any settings you might have changed. You'll find these options in Settings > Apps > Microsoft Edge > Advanced options.
Reset Edge the hard way
Delete the contents of this folder:
C:\Users\<USERNAME>\AppData\Local\Packages\Microsoft.MicrosoftEdge_8wekyb3d8bbwe
,
or for safety just stash them somewhere else.
This requires Administrator permission.
Reset edge to default settings via reinstall
Open PowerShell as Administrator and execute this command :
Get-AppXPackage -AllUsers -Name Microsoft.MicrosoftEdge | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register “$($_.InstallLocation)\AppXManifest.xml” -Verbose}
If no solution can be found within Edge,
you could always try another browser.
I would recommend using Chrome or Firefox.
Chrome is currently the best in multi-threading parallel execution,
so might best fit your needs.
I tried on fresh installs of Chrome and Firefox. They didn't work either. Proof here: https://www.dropbox.com/s/dw7qg3w8julfzfk/surface-2.mp4?dl=0
– abcjme – 2018-05-28T20:55:59.467What is the tablet? It looks as if when a video is being played, it just about uses the entire CPU. – harrymc – 2018-05-29T05:25:55.493
What gives you the impression that the whole CPU is being used? It's a Surface Book 2, with an i7 and 16 gb of RAM. – abcjme – 2018-05-29T16:15:49.247
The freeze is abnormal. Maybe a bad codec. – harrymc – 2018-05-29T16:27:48.960
It never froze. Tapping the video can act as play or pause. Because it wouldn't register my scrolling attempts, it was treating them as taps instead. – abcjme – 2018-05-30T05:32:03.870
Yes, but everything else seems from your videos to become unresponsive, as if all the resources of the computer were used up. – harrymc – 2018-05-30T07:14:14.063