> Either one is writing to the same program memory, so the write time is
> inherently limited to what the flash can do.  Both should be about the same
> assuming you don't have a communications bottleneck.
Depends on the pic.

For example on first gen 18F chips you can write the panels (of which 
there are 4 on a 452) in parallell with ICSP but you can only write one 
8 byte block at a time with self programming.

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