Your page builder is costing you leads. We measured how many.

We rebuilt the same landing page three ways: a popular drag-and-drop page builder, a lightweight block theme and a hand-coded template. Same copy, same images, same form. Then we split real paid traffic evenly between them for four weeks.

The load times

On a mid-range Android phone over 4G, the page-builder version had a Largest Contentful Paint of 4.1 seconds. The block theme came in at 2.0s and the hand-coded page at 1.4s. Most of the difference came from unused CSS, render-blocking scripts and oversized images the builder added by default.

The conversions

The hand-coded page converted 31% better than the page-builder version. The block theme landed in between. Bounce rate on mobile followed the same order.

What this does and doesn’t mean

Page builders aren’t evil. They let marketing teams ship without waiting on developers, and that speed matters too. The fix is discipline: limit global add-ons, load scripts only where they’re used, serve modern image formats and keep the number of nested containers low.

• Audit your templates for CSS and JavaScript you never use.
• Set a performance budget and check it before every launch.
• Test on a real mid-range phone, not your office laptop.