You should mention about your PC configuration first., or you can share config here
Computer Specifications
I'm newbee, but from experience, for windows 10 it's better to use SSD, you will never facing slow performance anymore., at least for me.
Anyway my brother have slowdown issue on his old laptop couple years ago,. sometimes its get bluescreen, and slow startup loading, and even shutdown took some times. He been using that laptop like 24/7 lol. And i heard tick tick tick sound,.. so after change it to SSD all problem gone,.. its seem the old HDD just about to die. I remember he's so happy after using ssd lol, ~almost 3-5 minutes boot time before and took only few sec / less then 1 minute after using SSD.