The Big Picture
While everything should be done to make a website load as fast as possible, if you have a PageSpeed score of 90/100, you are roughly in the 93rd percentile (93% of websites are slower than yours, and only 7% are faster) based on the information from Google where they state that a score of 100/100 represents the 98th percentile, and 50/100 represents the 75th percentile.
While you may not be considered in the “fast” category, a score of 80/100 still represents the 88th percentile — where you are faster than 88% of other websites.
One Page at a Time
If getting a score of 90/100 or higher is critical to you, and you have already had Pegasaas Accelerator WP optimize your pages, you should consider either targeting the specific pages that are drawing your average score down, or consider deactivating global plugins which may be causing a long load time.
One common element that can cause mobile load times to be higher and subsequent PageSpeed scores to be lower, is the use of third party “analytics” scripts such as “Google Analytics”, “Yandex”, or “Facebook Pixel”. Also, the use of “tag managers” (such as “Google Tag Manager”) can cause even further load time, as the tag manager must be loaded first, parsed, and then executed. Once the tag manager has been executed, subsequent analytics scripts are then injected, loaded, parsed and executed accordingly. When these analytic and tag manager scripts are used in a web page, they can cause the page load time to be increase by 1-5 (or more) seconds. If load time is important, you should consider reducing the amount of analytics scripts that are used with your site.
Beyond that, the Pegasaas Accelerator WP web performance analysis team can be hired to specifically advise on how getting a faster load time can be accomplished. If you’re interested in hiring the web performance analysis team, please contact them via the Pegasaas.com contact page.