Performance

TTFB, FCP, LCP and CLS for store owners

What important browser lab measurements say about the page customers experience.

A page can be available and still feel slow. Different measurements describe when the server responds, when content first appears, when the main content is visible and whether the layout moves.

Why this happens

No single number describes every shopper. Cache state, device and location influence a lab measurement, so the values need context instead of being presented as an absolute promise.

What StoreVigil can observe

StoreVigil translates the measurements into a per-page assessment and preserves the technical abbreviations as optional detail for specialists.

What merchants can do

Merchants can compare representative pages, investigate the slowest visible moment and recheck after changing images, scripts, apps or theme code.