The Bottleneck of the Web

Steve Souders, "JavaScript Dominates Browser CPU":

Ten years ago the network was the main bottleneck. Today, the main bottleneck is JavaScript. The amount of JavaScript on pages is growing rapidly (nearly 5x in the last 7 years). In order to keep pages rendering and feeling fast, we need to focus on JavaScript CPU time to reduce blocking the browser main thread.

Alex Russell, describing a prototype of "Never-Slow Mode" in Chrome:

... blocks large scripts, sets budgets for certain

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