Full Optimization gives black screen

Hi @vilayati ,
Thank you for contacting us.

The delayed JS functionality you are experiencing (black screen on mobile before loading the website content) is designed for speed optimization. It ensures that JS execution is triggered only on user scroll/tap, resulting in faster loading times. The element-rendering scripts won’t execute until prompted by actions from page visitors, so you need to tap/scroll first to get page elements.

As it is critical for a good website score, we would recommend leaving it in place, as users tend to start interacting with websites right away.However, you can disable the JavaScript Delay option anytime from the Website Booster > Settings section, which will allow the JS files to start loading right away. Please, note that the speed score will be worse.

Regarding the WebP image generation, please read this article WebP not activating automatically section: https://help.10web.io/hc/en-us/articles/6549143350034-Troubleshooting-the-10Web-Booster.? Your hosting provider needs to add the appropriate configuration depending on whether you are using Apache or Nginx servers.? Please, also confirm with your current hosting provider that all ‘mod_rewrite’, ‘mod_headers’ and ‘mod_mime’ PHP modules are enabled. We would appreciate it if you would follow these steps and let us know if they help.

And for the CDN, if integrated correctly it should not cause any downtime for the webiste. Please, make sure your website is not using a proxy service before enabling Cloudflare CDN not to face any issues.

Please, kindly let us know in case you are still facing issues.
Regards, Mane