—— Service · 09 / 09
Wix Speed Optimization.
A slow Wix site is rarely Wix's fault — it is the build's. Oversized images, blocking scripts, unsubset fonts, no lazy strategy. We rebuild the performance layer until Core Web Vitals are unambiguously green.
— The problem
Three reasons most Wix sites are slow.
Images uploaded at 3000px wide.
A single hero image weighs 1.4 MB. LCP balloons to 4 seconds on 4G. Easy to fix once spotted; rarely spotted.
Render-blocking that should not exist.
Custom code embeds dropped in <head>. Marketing scripts loaded eagerly. The site cannot paint until they finish.
Fonts loaded whole.
Three weights loaded for every page instead of subsetting to actual use. Each font is a 60-90 KB tax.
— What you get
A speed engagement, with numbers attached.
Image pipeline
WebP/AVIF where supported, responsive sizes, lazy on everything below the fold, eager on the LCP.
Font subsetting + display
Subset to language coverage, font-display: swap, preload critical weights only.
Render-blocking audit
Every blocking script identified and either deferred, async'd, or removed.
Marketing tag budget
GTM tags rationalised; per-script perf budget enforced.
Critical CSS
Above-the-fold critical styles inlined; non-critical loaded async.
CWV verification
Lab + field measurement before and after; written report.
— Why us
Why Wix-native speed work goes further.
We know what Wix can and cannot do.
Which settings move CWV, which are placebo, which workarounds the platform actually permits.
We measure real users, not just labs.
Search Console CWV is the source of truth. Lab Lighthouse is a sanity check.
We fix root cause, not symptoms.
A slow hero image is a CMS/image-pipeline problem. We fix the pipeline, not just the hero.
Speed-optimization questions.
On 412 sites we have averaged 98 Lighthouse and "Good" across all three CWV metrics. We commit to ≥90 on launch and back it with a written report.
No. Performance work is largely invisible — image swaps, font subsetting, script deferral. Design changes are flagged and discussed.
2–4 weeks as a standalone. Often bundled with redesign or SEO work.
In our case base, every meaningful speed improvement has lifted conversion. Product-page LCP especially.