Use SEO tools, like SEOKart, to compress the file size of the images, which does not hamper the visual quality of the images but reduces their size to load quickly
Implement AMP (Accelerated Mobile Pages), which allows Google to save cached versions of the pages on the mobile server and improve the loading speed of the website on mobile devices
Implement lazy loading for advertisement, as this technique enables the website developer to identify certain resources on the website and increase their waiting time to load to allow other critical resources on the website to load faster.
Reduce the number of redirects on the website to reduce overall waiting time for the users on the website
Utilize CDN to create proxy servers all across the globe to reduce the distance between the user browsers and servers, which reduces overall waiting time for the users.