Thanks for your answer.
My english is not very good… But
For the speed its the same on both environement 115200 for all communication.
For the file form LittleFS : i use the littleFS for my webserver’s files (html, js, css…).with the version compiled under PIO each file is served with 1 second (or more) delay and the browser (chrome or other) dont received all files and invoque timeout. But under arduino ide they are served immediatly. This is my real “bug”.
For the version of esp8266 core under arduino IDE it’s the 2.7.4. and under PIO this is framework-arduinoespressif8266 3.20704.0 (2.7.4) so 2.7.4 also ?
I’ve try the fsbrowser code this morning, And I’ve no symptome, no bug. I don’t have the time at this moment to do others tests, but i’ll make them in next days.
I’ll informe you about results.