Less throughput on stm32f411RE nucleo board

In stm32f411RE nucleo board even with 45MHz clock with dma configuration throughput is not crossing 3-4Mbits/sec.

Can any one suggest what changes need to do in the dma configuration or need to any other setting.

When I checked on oscilloscope interface delay is more with or without dma configuaration .

How to decrease the interframe delays between the packets.

Thanks in Advance

Chandra

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