Google Home shows my smart devices loading for around 10 seconds

I am using Google smarthome washer code to control my ESP8266 with SSR. Everything works fine but every time I open my Google Home app or Home Control in Nest Hub 2, devices are shown loading for around 10 seconds or more. But devices from other vendors like Philips Hue are shown in 2-3 seconds.

Any suggestions on what I might be doing wrong.

Here is the link to the code I used. https://github.com/googlecodelabs/smarthome-washer

I solved the problem, my reportstate function was not updating the states of the devices due to which QUERY intent has to be called everytime I opened Google Home app which increased the loading time. Home Graph viewer is the tool to debug.