Ismail Elshareef interviewed at Velocity 2010
summary
Explains why third-party ads slow pages: each ad pulls 8 to 12 assets, causing network latency and unpredictable downstream failures; iframes can be late‑loaded but JavaScript ads must be called during rendering and often block. Urges creatives to stop using document.write and to support asynchronous loading so sites control when assets load. Recommends keeping ad density low — two ads is usually enough because two ads can trigger ~24 extra HTTP requests.
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