How do I read my Faaaster site's performance measurements?

The site's Performance tab shows the Measurements from the latest PageSpeed test: Response time and the PageSpeed score. The resources your site uses are shown in the Monitoring tab, Latest resource measurements card, and the PHP recommendations in the Server tab.

Latest resource measurements

This card sits at the top of the Monitoring tab. Each row carries the definition the interface gives for it:

• Site memory — "Memory used by your site at the time of measurement, compared with the limit allocated to it."
• Site CPU — "Computing power used by your site at the time of measurement, compared with what is allocated to it."
• PHP memory peak — "Memory used by the diagnostic request, compared with the configured PHP limit."
• PHP workers — "Active PHP-FPM processes, compared with the maximum worker count."
• OPcache memory — "Memory used to keep precompiled PHP code available."

A row whose measurement isn't available for your site isn't displayed.

The "measured at …" note gives the time of the reading. Refresh starts a new reading, All metrics opens Resource details.

Performance tab settings

Below the measurements, the Performance tab groups the Cache and CDN & edge cache settings.

Quick actions

Two buttons are available at the top of the Performance tab: Clear cache and Restart.

The Measurements block

It relies on Google PageSpeed Insights, the same tool that is publicly available, and shows a score out of 100 as well as the TTFB — the time before the first byte is received. The tiles show the desktop version; on hover, Details opens the PageSpeed window, with the Desktop and Mobile buttons, the TTFB and the First Contentful Paint, Largest Contentful Paint and Cumulative Layout Shift metrics.

The score is read in tiers:

So is the response time: fast under 300 ms, adequate under 800 ms, slow above that.

The "latest PageSpeed test" note, next to the Measurements heading, reminds you where the figures come from; the screen doesn't show the date of the test.

A missing measurement isn't a bad score. On a new site, no test has run yet: the display shows a dash.

⚠️ Don't judge your site on a single reading. The PageSpeed score varies from one test to the next depending on the load at the time. It's the trend that counts, not the single data point.

Recommendations

The Server tab, PHP recommendations card, analyzes your measurements and suggests quantified actions: raising the number of PHP-FPM workers, the PHP memory limit or the OPcache limit. Each one shows the measured value and the calculated target. A Configuration recommendation is applied with the Apply button, after confirmation, without a restart.

When the target exceeds your plan's limit, or the resource can't be adjusted in Server — the environment's memory, for example —, the recommendation carries the Upgrade badge: its View plans button opens the Subscription tab.

👉 My site is slow · How do I monitor my site?

Updated on: 10/03/2026