How important is product performance to the user experience for your app? Where in the product is reducing latency important? Controlled experiments provide clear answers to these questions using slowdown experiments.By slowing down the product, we can assess the impact of increased latency on key metrics, including declines in revenue and user satisfaction metrics. (There are some mild assumptions we make while performing these)
At Amazon, a 100 msec slowdown experiment decreased sales by 1%. A talk by google and bing on how performance affects key metrics -
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