Bottom Line:
- MER is declining for most brands - and creative is getting blamed for a problem that lives on the landing page
- Post-click leakage (load time, message mismatch, checkout friction) is a direct tax on every euro of ad spend
- Fixing it improves MER without touching your budget or your creatives
Your MER is down. The team iterates creative. New hooks, new formats, new offers. Three weeks later, MER is still down.
The creative wasn't the problem. The page was. Nobody checked.
What MER actually measures
MER - total revenue divided by total ad spend - tells you whether money in is generating money out. It doesn't tell you where revenue is leaking between the ad and the confirmation page.
That gap matters. The response to a creative problem and the response to a post-click problem are completely different.
Post-click leakage is drop-off that happens after the customer clicked - after you've paid. The nCAC is already accrued. What you lose from that point is pure P&L leakage.
Three places it shows up
Load time. A visitor who clicked a Meta ad on mobile and waits more than three seconds will often bounce before seeing a product. Google's data is clear: roughly 7% conversion loss per additional second. A five-second load on a mid-range Android isn't an edge case. It's a fraction of every campaign you run, permanently.
Message mismatch. The ad promised a product, a price, a collection. The landing page delivers a homepage. The customer was primed to buy something specific and arrived somewhere that requires them to search for it. Measure it directly: compare CTR to first-page bounce rate. High CTR with high bounce means the ad worked and the page failed.
Checkout friction. Field count, payment options, error handling, mobile UX. Every unnecessary step loses a percentage of buyers who had already decided to purchase. Abandonment at payment is not a targeting failure. It's an infrastructure failure.
The fix doesn't require more spend
Post-click improvement is not like creative or targeting optimisation. You're not spending more - you're capturing more of what you're already spending. A 10% reduction in post-click drop-off compounds across every future campaign. Budget stays flat. Output improves.
Start with measurement. Separate MER by traffic source and landing destination. If MER is weaker on high-CTR campaigns, creative is not the variable. The page is.
Want to see if this applies to your store?