ESP8266 and ESP32 Delay issue

[robocircuits]

I have tried a lot of iot platforms and most of them give low latency.
i tired latency in this code and got weird issues.

1. normal delay of 0.88 - 1.33 seconds
2. if the board is kept untouched for 5 minutes delay or latency increases to 3.00 - 35.00 seconds.
3. then once tested after long time again it works with 0.88 - 1.33 seconds

i just wanted to know if there is any sleep function or something i can turn off so that this instability can be countered.
i want constant delay throughout the working of device and i want it to be minimum.

thanks for help in advance.