The landing page is where an ad's promise is fulfilled and where the conversion event — a purchase, a lead form, a deposit — actually happens, making it just as decisive to overall CPA as the ad creative itself. A landing page that loads slowly, doesn't match the ad's message, or has a confusing form will suppress conversion rate no matter how strong the ad is.
Agencies running paid traffic without direct control over a client's landing page treat page speed, message match, and form friction as the first things to audit when CPA rises unexpectedly, since a strong ad sending traffic to a weak page produces good CTR and bad CPA simultaneously.

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