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Metrics

Updated Time to First Byte recommendation

Ben Schwarz
Ben Schwarz

Previously Calibre recommended that Time to First Byte (TTFB) should be below 150ms for a good user experience. The recommendation has now been updated to < 300ms based on global data from the Chrome User Experience Report (CrUX).

In Calibre, you will now see a warning if your TTFB is above 300ms and a critical error if it is above 800ms.