Altera Avalon Uart performance problem

I should have made me more understandable. My suggestion is, trying your communication on JTAG, which has FIFO, to see if you still lose characters. If not, that means your problem is caused by the lack of FIFO in Nios UART. But you said you had tried a FIFO'd uart,

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I just don&#39;t understand why I would be dropping characters, even with a FIFO&#39;d uart.[/b]

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can you tell me which UART you tried?