A really slow SSD write speed

[sckn]

GA-H270N-WIFI, i5 7500, Asus Gt 710, Sandisk plus 128 GB * 2.

I've just tried my SSDs, in a linux distro, they are perfectly fine.

But, I don't know what cause the problem in my Catalina Installation. What information do I need to provide you guys ?

Thank you for your help.

 

[nineniner]

Me too. I have 2 Sandisk plus 240gb drives, and one drops as low as 3MB/s write and the other drops to 30MB/s write in AJA. They score 400-500 in windows.