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J. Nick Koston
a9ec101631
Byte-by-byte `progmem_read_byte` for a 512-byte chunk does 512 aligned 32-bit flash reads + shifts on ESP8266. Switching to `memcpy_P` lets the SDK do bulk aligned-flash copies. Other platforms get a plain `std::memcpy` since their `PROGMEM` is a no-op and the blob lives in normal address space. `memcpy_P` is only available on ESP8266 (via `<pgmspace.h>`), so the implementation is platform-gated; both paths boil down to a one-call copy.
