ESP8266 Community Forum

Hi,
spiffs very slow system of the worst known
if your recording:
1) 100 kB - 3 sec; .................... 33 Kb/s
2) first MB -17 sec; .................. 59 Kb/s
3) second MB - 220 sec;.............. 4.5 Kb/s
4) each of the next MB - 380 sec;..2.6Kb/s

SPIFFS is really a read many, write occasionally File System. Also flash has limited write cycles so if you are wanting to log a lot of data then you are really better streaming it over TCP/IP to a data logger.