Chat here about code rewrites, mods, etc... with respect to the github project https://github.com/esp8266/Arduino

Moderator: igrr

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By RichardS
#89075 From prior experience I would say that when saving the audio onto a newly formatted SPIFFS, you will save the audio fast at the start but it will quickly start to slow down to the point it will not be able to keep up....

Try LittleFS maybe it is better for this...

Also in any case, if your saving one byte at a time, it may be better to buffer and save the buffer at once, not sure what the "sector" size is but its usually best to choose a multiple of that.

RichardS