Datasheet
Page 17
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Right click on the USB Serial Port (COM18) item and then select Properties.
Select Port Settings tab.
Click the Advanced... button.
Set Latency Timer to 1 and click OK.
Tips and Tricks: Speed-up UART data transfer
If .HEX le transfer from your PC to 
MCU is too slow, it’s possible to speed 
up data transfer by setting latency 
time of COM port to 1 ms. This is done 
in Device Manager:
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