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Thank you John, but that would actually only average more each sample (for a same number of displayed samples) and consequently flatten/smoothen the level of detail of the graph. I was hoping to have a large sampling scope (with same level of detail).
This is not a solution to your problem, but you can download a task manager alternative or just download the old Windows-7 style Task Manager (just be sure to read the instructions in the article, because the original task manager has no startup tab and they moved the startup options from msconfig to the new task manager so you'll need to restore the old msconfig, too):
Get classic old Task Manager in Windows 10
Thank you very much You for this option -- it is indeed too much for what I was seeking. The article you are pointing at is quite interesting in comparing old/new task managers nevertheless !
Would Performance Monitor give you what you want? You can set the duration to whatever you want (right click, properties)
Thanks lx07 ! It actually does provide a pretty acceptable workaround... if I am prepared (can't catch up on the past) but the level of detail and vast amount of parameters that can be observed certainly deserve that preparation imho.