A lab test measures one page under a simulated device and network. Field data describes real visits over a reporting period. The numbers answer different questions and can disagree without either being wrong.
Check the slowest customer journey, not only the homepage. Large images, font shifts, third-party scripts and delayed server responses can affect different pages in different ways.
Make one meaningful change and retest under the same conditions. Keep an eye on forms, layout and checkout after optimisation. A higher score is useful only if the site still works.
Vladimir Nikolaev
Development and SEO at WebSoftLeader. Clear explanations and a practical first step for your project.
About Vladimir
