Calculator · 5 minutes
Site Speed Conversion Loss Calculator.
Your homepage takes 4 seconds to load. Here is what that costs you in lost form-fills and revenue per month, plus what an owned stack recovers.
Back to The VaultEvery additional second of load time drops your conversion rate by about 7 percent. Wix and Squarespace homepages typically clock 3 to 5 second LCP. A custom site on modern hosting clocks under 1.5. The gap is not vanity, it is revenue.
This worksheet maps your current speed + traffic + conversion into the form-fills you are losing every month. If the math says do not bother, it says that.
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Why a slow site is a tax, not a quirk
Speed is the silent conversion killer because nobody sees it leave.
01 · Mobile abandons faster
Google research: a 4-second mobile load loses 24 percent of users before the page renders. They never see your headline. Bounce rate is your baseline failure mode at 4+ seconds.
02 · Ad spend gets refunded to nobody
Every paid click that bounces because of speed is money you sent to Meta or Google for nothing. A 30 percent bounce-from-speed rate means 30 percent of your ad spend is theoretical.
03 · SEO penalizes you twice
Google ranks fast pages higher AND penalizes high bounce rates. A slow page bounces more, which signals "low quality" back to Google, which suppresses your ranking, which drops your traffic. Compounding loss.
04 · Wix/Squarespace cap your speed
No matter how aggressively you optimize images and minify CSS on Wix, the platform serves a heavyweight runtime. Real LCP improvements require leaving the platform.
05 · Slow pages lose specifically the buyers
Casual browsers wait. Buyers ready to act are time-pressured. Slow speed disproportionately filters out the intent-rich traffic that actually converts. The visits you keep are the ones least likely to buy.
06 · The gap compounds with traffic
A 7 percent conversion drag at 500 visits is a rounding error. At 50,000 visits it is a salary. Your speed problem grows linearly with your traffic; fixing it scales the same way.
What this calculator actually counts
Conservative numbers. Real research underneath.
Speed-conversion math comes from Google, Akamai, and Cloudflare research. The figures here use the lower-bound estimates.
Per-second drag
7 percent conversion drop per second
Google research: every second of additional load time drops conversion rate by approximately 7 percent. The relationship holds linearly between 1s and 7s.
Mobile multiplier
Mobile is 2x more sensitive
Mobile users abandon roughly twice as fast as desktop. The calc weights your mobile share against the per-second drag rate accordingly.
Owned-stack baseline
1.5 second LCP target
Modern hand-coded static sites on Cloudflare Pages or Vercel typically hit 1.0 to 1.5s LCP without breaking a sweat. Comparison baseline is 1.5s, not the absolute minimum.
Wix typical LCP
3.5 to 5 seconds
Standard Wix templates clock 3 to 5 seconds on mobile real-world. Some templates worse. The platform runtime is the floor; you cannot optimize past it.
Not counted
SEO ranking lift
Faster sites rank better, which means more traffic, which compounds the conversion lift. The calc does not factor this because it varies wildly by niche. Real lift is typically 15 to 30 percent more than the calc shows.
Not counted
Brand perception lift
Fast sites read as professional. Buyers correlate speed with quality and modernity. This shifts close rate on existing leads in addition to capturing more leads. Not modeled here.
Want this emailed to yourself?
Your numbers, the methodology, and a 1-page brief listing the targeted fixes for your specific platform with expected lift per fix.
No newsletter. No auto-follow-up. We will not show this to a sales team.
What people noticed after the speed fix
Our LCP went from 4.2s to 1.1s after we left Squarespace. Form-fills doubled within 30 days. Same traffic, same offers. Just no more 4-second wait at the gate.
r/web_design · 2026-04
Spent two months trying to optimize Wix. Compressed every image, killed every animation. Could not get below 3.4s. Switched platforms in a weekend, hit 1.0s on launch.
r/Wix · 2026-03
Did not believe site speed was that big a deal until I added Microsoft Clarity and watched session recordings. People literally clicked away mid-load. I was not even getting a chance to fail my pitch.
r/smallbusiness · 2026-04