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Slow times on USB compared to Ethernet for cRio 9149

I have a FPGA loop running on crio 9149. I control it / transfer data from/to my host PC via NIFPGA C API. When having the cRio connected via USB I see a big increase on overall Execution times compared to Ethernet connection. Is it to be expected this kind of increase in time for small buffers? (under 512 bytes)? Another question: What would be execution time difference on USB vs Ethernet for NiFpga_ReadBool()? 1ms,10ms increase?
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