I use the RX580 8GB graphics card. Why is version 10.2 more memory than version 11?

Version 11 speed is very low. And I used the -h command, and it does not help speed up the speed.


Below is a sample image.

claymore v11 memory used down from v10.2
Speed of use down.
Help fix the problem. for Memory 8GB.



The details are in the picture.