Data-s(h)aver strategies

More and more people are making use of the data saver mode built into their browser. As website owners we should listen and serve a lightweight version when the data-saver request header is present.

I’ll share the approaches, trade-offs and results from my journey shaving off bytes on With around 30K daily visitors it is the largest scale modeling website in the world.

I have been using performance budgets for many years, but the new light version (consuming 50% less bandwidth on an iPhone) unexpectedly broke this model. I will also address how the use of a data budget matrix solved the issues I faced.