A client couldn't understand why their ad campaign wasn't converting.
Good targeting. Compelling offer. Solid budget. Everything on paper looked right.
I asked one question: "Have you loaded your own landing page on your phone, using mobile data, not WiFi?"
They hadn't. Nobody on their team had.
I did. It took 8.4 seconds to load.
Their ad budget was sending people — who were already interested enough to click — to a page that made them wait 8 seconds before showing anything. Most of them left before the page even finished loading.
The ad wasn't the problem. It was working exactly as intended, driving clicks. The landing page was quietly throwing those clicks away.
THE CAUSE
Once we looked, it was straightforward: three uncompressed images, each over 4MB, loading before any actual content appeared.
THE FIX
The fix took an afternoon. Compress the images, add lazy loading, done. Load time dropped to 1.9 seconds.
Same ad. Same budget. Same targeting. Conversion rate more than doubled the following week.
THE PATTERN
Here's the pattern I keep seeing: businesses test their website on fast office WiFi and assume that's what customers experience. It rarely is.
Before you spend more on ads this quarter, it might be worth testing something free first: turn off your WiFi, load your own site on your phone, and time it honestly.
Sometimes the expensive problem has a very cheap fix — it's just easy to miss because nobody thought to look.