SSDs Slow Read Speed of Stored Data

[pavichokche]

I have these Teamgroup CX2 2TB DRAMless SSDs that I'm currently using for storage of movies and TV shows. It's all hooked up via SATA to my motherboard (AsRock B550 Phantom Gaming 4/ac).

Yes, I'm aware of their limitations in writing due to the lack of a DRAM cache, but recently I noticed VERY low reading speeds while trying to copy some data from them. A run of HD Tach (attached image) shows effectively what I observed while trying to copy. The section with normal read speeds is the part of the drive which is empty. CrystalDiskMark and other performance benchmarks run FINE again and again, producing the expected (rated) read and write speeds. Real world write speeds are entirely satisfactory for me, but surprisingly copying stored data from these drives is super slow.

 

Any ideas what is going on here, and if/how I can improve this?