MicrosoftAnother point for slow CUs are commonly Laptops with HDDs.
Why is that :
In the field I see very high HDD fragmentation rates of 4% to up to 30% or even more.
A fragmentation of 3% is enough to severe decrease overall Windows response, not limited to CU install times.
A System with 5% or more can take ages to do the most simply task just like installing VLC taking 5 minutes while task manager reports high HDD usage of 50-100%.
Other factors :
Notebook CPUs are really slow especially old ones from AMD and Intel (Dual / Quad) from 2006-2014
Slow means they are not comparable to Desktop CPUs at all.
HDDs in Notebooks are small 2.5 drives with few cache and 5400rpm or less and thus having tremendously bad random access times, which is crucial for CBS/DISM/Tiworker.
I am not saiyng old laptops or computers are to be replaced. But a new SSD and more RAM can do wonders.
