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Philosophy On Performance

Fewer Network Requests Is Better

Page performance is a function of 1) queuing requests, 2) waiting for the browser to connect to the network, and 3) waiting for requests to complete and transfer data.

More network requests made from the browser create a higher potential for network-level latency, race conditions, callback queuing, render thread resource blocking, etc. We try to absolutely limit the number of requests with Rapid Reviews. Our entire javascript, html and css payload is just a single request. In addition to these requests, we have a few images requested here and there for icons and such (which are not render-blocking). That's it!

Javascript Libraries Are Bad For Performance

This is a generalization, but a safe generalization. Let's use use JQuery as an example. It is a browser library on top of bare javascript that can save developers a lot of development time. It's really great.'s an extra 30k of data to the browser. Furthermore, it prioritizes ease of use over performance in certain cases. The closer you can get to the core language, the faster you go.

By using libaries to abstract code intent, there are pockets of poor performance or lazy patterns that go unnoticed by the developer.

Javascript Animations Are Expensive

Javascript animations are expensive in three ways, 1) they require almost 10x the amount of code, 2) they require more memory and processing power from the browser window, and 3) the user is conditioned to wait for animations to end before taking action. More animations in code can drastically affect the page load and severely impact rendering performance (particularly in low-memory/low-CPU environments). More animations slow down the browser. More animations slow down the user. Slow is bad!

Learn more about why jQuery hurts performance >