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You've devoted time, energy, and money into plans for a big campaign, only to have the overwhelming demand crash your site or app. When web traffic surges suddenly, it overloads even the world's largest businesses. Here are some prime culprits and actionable steps you can take to mitigate them. Caching is one of the most effective and least expensive ways to improve scalability and performance. It can be implemented on your infrastructure, in your application, or at the data level.