I have a laptop (HP ENVY x360) that is only a year old. It has 16GB of RAM, an Intel-i7 7500u 7th Gen, and a Samsung PCI Express 512GB SSD. When I read/write to the drive, it hangs for a second or two unless I'm flying through a lot of files then it can read quickly. It's almost like it needs to warm up to work properly. I ran a speed benchmark on it and everything showed up fine. I also disabled write caching which I was told may speed it up (I don't see why though). It's a Win 10 laptop running the latest build.
Does anyone have any ideas on what may be slowing it down? I have an SSD on my other machine as well but that's over a normal SATA port and it flies 24/7. Is PCI Express v4 not a fast interface/iffy?