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In libpq, in the code of the lo_import function, for each piece of a file of 8KB in size, lo_write is called, which greatly slows down the work of lo_import because lo_write sends a request and waits for a response.  The size of 8KB is specified in define LO_BUFSIZE which changed from 1KB to 8KB 24 years ago. 
Why not increase the buffer size?

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