MS decided Skype is a must have installed with the new office suite, it's idiotic. The default install one you can remove though.
Since when is W10 not usable right after boot? I do so all the time? Did I miss a memo or something?
The day before yesterday I upgraded a really crap Pentium laptop from 2010, had a 250GB HDD, 2GB of RAM. It took near two minutes to boot in W7, after upgrading it was around the 40 second marker.
In terms of apps, before it would freeze if you swapped between two Firefox tabs, can't have a second app running, now it manages about three for general usage, mostly thanks to the RAM compression. Linux would have been better, but not going to swap it for a pensioner.
Still a crap machine though, wanted to add 4GB RAM I had lying around, but the design was idiotic, would have had to remove the keyboard and go in from the top, didn't have a prying tool on-hand.
For you nothing is probably usable after boot since your hardware is probably even worse than the laptop above, since you're still holding on to that iPhone 5.