Lab is one run
Lighthouse is useful for debugging, but one synthetic navigation cannot represent every customer.
Free Shopify performance test
Test your Shopify store speed
Run one protected mobile Lighthouse test. See lab metrics, available real-user Core Web Vitals, large images, blocking work, layout shifts, third parties, slow resources, and evidence-based fixes.
Pinned mobile lab profile Lab and field data kept separate No Shopify login needed
Test one storefront page
Use a public store, product, collection or landing-page URL.
One synthetic mobile run
The test uses a clean, throttled profile. It does not access Shopify Admin, private themes or customer sessions, and it never treats lab TBT as field INP.
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Measure before guessing
Separate observed speed evidence from assumptions
A single score cannot explain a slow storefront. The report keeps the lab run, eligible real-user data, resource evidence and Shopify guidance distinct.
Pinned Lighthouse
One protected mobile run with the engine and profile shown.
Lab metrics
Performance score, FCP, Speed Index, LCP, TBT and CLS.
Field evidence
Separate CrUX phone Core Web Vitals when publicly available.
Image delivery
Large files, sizing and LCP discovery opportunities.
Blocking work
Render-blocking resources and expensive JavaScript evidence.
Third parties
Measured external transfer and main-thread work, without blame.
Read the result honestly
What this speed test means
Field data stays separate
CrUX uses aggregated real visits and may be unavailable or scoped to the whole origin.
Evidence is not blame
An external script can add measured work without proving that an installed app caused the slowdown.