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Why Domain is Loading very slowly but when opening directly through App Engine Url it is opening ver

I have a Domain which i bought it from and i have linked it to Google App Engine Flexible(NodeJs) Environment.

Now I when I am opening my Domain then it is sometimes taking more than 5 secs to load and sometimes I am getting Error

Server Error - 502

But the thing is when i am directly opening my app engine url which is https://************ then it is always opening without status code 502 and also very fast.

Can anyone please tell me why this is happening.