using analogRead(A0); in loop causes failure about fsbrowserng HOT 4 CLOSED

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Please, send a link to your code. Are you using delay() to control sampling?

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No. I discovered delay is not compatible with the async library.
This is the simplest example that fails
FSBrowserNGmod.txt

Here I slow down sampling and it works if interval is 2ms or more. I also moved ESPHTTPServer.handle();
to setup
FSBrowserNGTestAddingCode.txt

from fsbrowserng.

Yes, it works as you've noticed.

Think that ESP8266 is a limited device. Its IP stack runs on software and there is one unique core. So, if you ask for intensive work IP will be unstable.

I've tested that you can do sampling as fast as 250Hz, but anyway sampling is unstable; if processor attends HTTP requests then it cannot do sampling. You can increase sampling to around 350 Hz if processor clock is set to 160 MHz.

For real-time operations, you can look for a different platform as, for instance, ESP32. Moreover, you will have to play with timer interrupts to be able to get stable sampling frequency.

You can check Color Chrod by CNLohr where high-frequency sampling (around 600Hz) is done but that project does not use Arduino environment and has needed a great optimization using assembler code.

More details here: http://spectrum.ieee.org/geek-life/hands-on/how-to-turn-music-into-colors-with-a-wifi-bridge.

Another option is to use an external I2S ADC.

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