<b>Server-side vs client-side A/B testing for affiliate CTAs</b>

<b>Server-side vs client-side A/B testing for affiliate CTAs</b>

Testing button copy or table layout on a review page? The where matters more than the which-tool.

<b>Client-side (most visual editors)</b>
Pros:
— Point-and-click variant builder, no dev needed
Cons:
— The flicker: original paints, then the variant swaps, visibly
— That flash tanks layout stability and can spook the click you're testing

<b>Server-side / edge testing</b>
Pros:
— No flicker, variant arrives pre-rendered, friendlier to page speed
Cons:
— Needs dev work or edge-worker setup
— Slower to spin up a quick test

Who should go client-side: low-traffic sites running occasional copy tests.
Who should go server-side: high-traffic money pages where the flicker itself biases results.

Gotcha nobody mentions: affiliate conversions happen off-site, so you can't measure final sale, only click-through. Optimize for qualified clicks, not vanity CTR, or you'll "win" tests that send junk traffic.

<b>Bottom line:</b> on your top earners, kill the flicker first; everything else is secondary.