Website Speed in 2026: Why a 1-Second Delay Kills 20% of Conversions
Page speed is the most underrated conversion lever. Here's the data on speed-to-conversion in 2026, and how to fix it fast.
Page speed is the conversion lever everyone underestimates.
The 2026 benchmarks
- Under 1 second LCP: baseline for high-converting sites - Under 200ms TTFB: required for AI search ranking - Under 100KB initial JS bundle: the new mobile standard
A site loading in 3 seconds vs 1 second loses approximately 20% of conversions. We've measured this across dozens of client rebuilds.
The biggest culprits
Hero videos that autoplay before LCP. Lazy-load below the fold. Always.
Custom fonts loaded blocking. Use `font-display: swap`. Or better — use system fonts for body text.
Massive JS bundles from page builders. WordPress + Elementor sites routinely ship 2-4MB. Modern frameworks (TanStack Start, Next, Remix) ship 100-300KB.
Unoptimized images. Serve WebP/AVIF. Resize to actual display size. Lazy-load offscreen images.
Third-party scripts. Each chat widget, analytics tag, pixel = 50-200ms. Audit ruthlessly.
How to fix it this week
1. Run Lighthouse on your three highest-traffic pages. 2. Cut anything below 90 performance. 3. Move to a fast framework (TanStack Start / Next / Astro) if you're on WordPress + a heavy theme. 4. Lazy-load everything below the fold. 5. Defer non-critical scripts.
A 1-second improvement is worth more than most marketing campaigns.
Ready to put this into practice?
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