Hello there,
This depends on your internet connection. Maybe the internet speed in your area is little low. That's why it is happening. This problem occurs mostly because of internet issue. Also, if you see that your other apps are also working slow, then try to clean the cache files, or your recent apps. That makes your device work smoothly, if it had been lagging earlier.
Hope this answer helps you.
Thank you!!

Dear Aspirant,

It is not clear from your question, are you developing the site?

If you are developing the site and this problem is there it might be because of the host where you are hosting your website. In that case you should contact the service provider or maybe double check the code.

Hope this helps. Comment more details for further assistance.

Thank you.