How to achieve good Cumulative Layout Shift report on mobile speed

I want to set the image height and width attribute to reduce CLF (
Cumulative Layout Shift) on mobile and desktop. how to reduce this any idea. for caching I m using w3 total cache plugin.

have a look on my google insight report: https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fwww.snh.net%2F&tab=mobile

Hi,

Thank you for contacting us. I am happy to help with your queries.

Website optimization seems likely out of the scope of theme’s support as there are many aspects that could slow down a website, for example plugins, server environment, uploaded media, etc.

What I can recommend to you is this documentation, that provides some basic information on how to speed up your WordPress website.

I hope that helps.

Regards,
Kharis
aThemes Support