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Thanks! When was this function introduced (which Quartus release?)?
I doubt that it will be faster at the JTAG layer (since the JTAG traces show that master_read/write_memory are as efficient as possible), but at least it saves Tcl performing binary->string and string->binary conversions.
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It was first introduced in ACDS 12.1 I think.
Tcl is actually pretty good at conversions providing you use the right data structures. Where master_read_to_file and write_from_file really win is that they can do overlapped I/O (starting the second transfer while the hardware is processing the first one). For big transfers this hides the latency of the transfer and leads to a big performance improvement.
Out of interest, which tool are you using for your JTAG tracing?
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