The following run of the test shows an example performance with a 300 MHz PL and 128 bit AXI interfaces for the DMA.
root@xilinx-zcu102-2020_1:~# dma-proxy-test 100000 128 1 DMA proxy test Verify = 1 Normal Buffer Performance: Time: 247189 microseconds, Test size: 128000 KB, Throughput: 530 MB / sec DMA Buffer Performance : Time: 247364 microseconds, Test size: 128000 KB, Throughput: 529 MB / sec Time: 16180500 microseconds Transfer size: 12800000 KB Throughput: 810 MB / sec DMA proxy test complete