UART error rate at higher baud rate

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iammb

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Hi,
I am using Serial1 at higher baud rates(921600 and 3000000), i want to know how reliable is Serial1.read() at lower core clock. Usually i set teensy3.5/3.6 core clock to 120Mhz but if i set core clock to 48Mhz for these baud rate, will there be error involved while reading or writing data?
I have added hardware flow control for Serial1, if that sufficient to avoid uart errors?
 
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