Question Slow POST but fast boot?

[baribari]

My system (ASRock X570 Pro4, Ryzen 5 3600 (?), 10 year-old PSU, five-year-old GTX 1070, 16 GB ram, very fast SSD drive that I can't remember the name of) takes around 10 seconds to POST but once it does, it boots within just a few seconds.

What can cause this to happen?

 

[baribari]

it also beeps five times when I use UltraFast boot