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Silicon Labs CP210x: Data transfer from PC takes very long time. Is there any way to improve the transfer speed?

CP21xx

It may be improved depending on how the PC application is designed.
There is information on the communication mechanism of the CP210x on the SiliconLabs community site, but it is designed to transmit data in units of 64 bytes. Therefore, it is efficient to send data in batches.
When designing a PC application, if the software is designed to repeat sending 1 byte, sending 1 byte, and so on, the communication time will increase significantly. Changing the software design to send in batches may improve the data transfer speed.

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