Page optimization means one page (URL) of your website being optimized once. If your page has versions (e.g. mobile and desktop), then this would be two optimizations, one for each version of the page.
You need NitroPack in order to boost your website loading speed, improve your website conversions, and improve search engine page ranking. NitroPack is Google-PageSpeed-focused speed optimization tool.
NitroPack is just a different type of service. CloudFlare does only limited number of web-specific and content-specific optimizations, whereas NitroPack optimizes all the Google-suggested speed guidelines. NitroPack is designed to make your website load fast by boosting your PageSpeed Insights score.
NitroPack is very efficient and helpful for big traffic campaigns on your website. It makes your website skip the server work on each visitor landing on a public page, hence makes your server use much less CPU and memory for serving the same visitor base.