JavaScript the page downloads but never uses Lighthouse: Reduce unused JavaScript · Est savings of 456 KiB · could save about 1.5 s
Connections to other servers start late Lighthouse: Preconnect to required origins · Est savings of 330 ms · could save about 0.3 s
Styling code the page downloads but never uses Lighthouse: Reduce unused CSS · Est savings of 31 KiB · could save about 0.2 s
What it costs
Google calls 2.5 s or less good for the main content. burlington.com is 6.9 s past that on a mid-range phone.
Speed is money: in Deloitte's 2020 study Milliseconds Make Millions (37 brands, 30 million sessions), making a site just 0.1 s faster on phones went with 8.4% more orders for retail sites and 10.1% for travel sites. Most slow pages come down to one or two root causes.
Want it fixed?
We find the root cause across the browser, the network and the server, fix it,
and prove it with a before-and-after test. Start with a Diagnosis: a written root cause and a fix plan.