On my work machine (approx 4 years old, Win10) and home machine (mostly 2 years old, graphics card, a 1060/6GB is more elderly, Win10) both take most of a second to bring up a fresh Explorer window, timing by eye from Win+E to the whole UI being present. It seems far more variable (sometimes feeling quicker, sometimes taking a couple of seconds) on my laptop (<1 year old, i5 CPU 16G RAM, Win11). All are using decently speedy SSD drives.
Several seconds sounds like an exaggeration, but it never seems anything but sluggish to me.
One UX delay that irritates me is the time it often takes between hitting Win+R and the run dialogue finally being ready for input. Regularly the first few characters of what I type after that ends up going to the app that originally had focus. That used to be instant, on much older kit.
