Siliconguy
macrumors 65816
Crystal Disk is a Windows program. using it to benchmark a Mac isn't going to produce decent results. Try BlackMagic.It's purely a choice by Apple.
Comparison of budget laptops:
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I don't know how you find an SSD that slow. Gen 3 is 3,500. Gen 4 is 7,500. Gen 3 came out in 2013.
As for memory used with Safari and Activity Monitor open.
By comparison using integrated video Mint Cinnamon uses 1.6 GB sitting idle, MATE about 1.2, xfce a bit less, Plasma a bit over two, but that machine has a video card so the graphics is likely on that instead of RAM.