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As you may already know, the data transfer in TFTP happens in terms of blocks of data. Each block of transferred data must be acknowledged by an acknowledgment packet before the next block can be sent. Possible way to increase the TFTP speed is to increase the block size. Kindly try by increasing the block size in multiples of 512. The default size is 512 bytes.
The TCP/UDP throughput is dependent on the channel bandwidth, band, window size and other parameters. The max throughput mentioned in the datasheet is for 80MHz bandwidth with measurements carried out in the closed chamber. The achievable data rates are usually 60-80% of the mentioned rates.