Hi @sabbir009,
Apologies for the delayed reply here.
It appears that you have a preloader on your page which needs JavaScript to reveal the page’s content. However when the page is visited in a browser without JS support the page remains blank.
When running NitroPack in Ludicrous mode the first few moments of a page’s life cycle are similar to visiting the page without JS support because some of the JS code is delayed. In this case PageSpeed perceives the page as blank hence why it cannot produce a result.
To resolve the issue simply add this CSS snippet in NitroPack’s custom CSS option:
.aux-page-preload #inner-body {opacity: 1 !important; visibility: visible !important;}
This will disable the preloader on optimized pages, since they are being rendered instantly anyway.
Doing this should get your scores to ~80 on mobile and 90+ on desktop.
Regards,