Even on a highish end Western Digital SN850 for my C drive, loading times are super slow.
However my D drive is double the speed because I use Raid 0 SSDs for that (6.5k read speed C drive, 13k read speed D drive).
I wish I could have my saved games on the D drive as well to benefit. Also no, installing Windows to a raid partition is very ill advised because both windows doesn't play well installed on a raid configuration, and you lose access to trim, so such a drive would end up getting wrecked from page filing.
