When to do CRO

CRO experiments require statistical significance, meaning enough visitors to detect differences. Below a certain scale, it's too slow to be worth doing.

Minimum traffic

10K unique visitors/month per tested page, roughly. Lower scale = longer tests = less learning.

When to prioritize

• High traffic, low conversion (CRO wins big)
• High-spend paid ads (every conversion matters)
• Stable product (testing isn't chasing a moving target)

When to delay

• Pre-product-market-fit (fix the product first)
• Very low traffic
• Radical site redesign planned anyway

What to do with this

• Don't start CRO below 10K monthly visitors, statistical tests require volume to produce signal
• Hold on CRO during product rebuilds, you'll invalidate any tests when the underlying flow changes
• Start CRO when paid acquisition CAC hits your ceiling, conversion lift is the cheaper lever at that point
• Pair CRO with a dedicated weekly tester, ad-hoc CRO produces no compounding
• Re-evaluate readiness quarterly, most teams who say "we'll do CRO later" stay in that phase longer than needed