Reduce CPU load during interrupt handler

[Jason2866]

See esp8266/Arduino#7057 (comment)

[Aircoookie]

Hi Jason!
Thank you for the PR :)
(by the way, I am super happy that you found my project. I am very grateful for all the work you and others have done on Tasmota. I use it on several Sonoff's and it is amazing how stable it is)

[Jason2866]

Thx, i like your project a lot. So much fun with lights!
Talking about stability we have best experience with

; NONOSDK22x_190703 = 2.2.2-dev(38a443e)
                            -DPIO_FRAMEWORK_ARDUINO_ESPRESSIF_SDK22x_190703
; lwIP 2 - Higher Bandwidth no Features
                            -DPIO_FRAMEWORK_ARDUINO_LWIP2_HIGHER_BANDWIDTH_LOW_FLASH

using other combination has "glitches".
We are still using core 2.6.1 the later cores does not bring any benefit (for us).
What works nicely is in stage/core the feature OTA upgrade with gziped firmware bins.
Cya Jason