CATEGORY · Performance · B05
TTFB (Time to First Byte)
TTFB measures time to the first response byte. Depending on measurement context, it includes network, connection, redirect and server-processing delays.
Full definition
TTFB measures time to the first response byte. Depending on measurement context, it includes network, connection, redirect and server-processing delays.
Concrete Shopify example
Illustrative example: a collection responds slowly before images start loading. Inspect HTML timing and redirects before treating it as an image problem.
My take
Compare consistent network and geographic conditions. Separate document response from media loading; a CDN does not fix all expensive processing.
Related terms
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Sources and editorial context
Teo Comyn · Updated
Technical references consulted for this revision. Illustrative examples are not measured client results. Check the current documentation and your store before applying a change.
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