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Sounds good, but in my experience 3g also varies by an order of magnitude (5 KB/s - 50 KB/s).

When I have 20-50 KB/s stable 3g, browsing the web is a bit slow, but most sites work pretty good. Also messenger aren't a problem.

But working below 20 KB/s is a pain.

Chrome dev tools has a reasonable connection bandwidth simulator. Is there a good one that also simulates variability / packet loss in addition to bandwidth caps?

It'd be nice to have a simple way to limit a chrome tab's available CPU in the same way. The computers, tablets and phones most people browse on are an order of magnitude slower than the desktop machines we use to develop.

You can throttle the CPU in Chrome Devtools

Yup – I love this idea. I actually occasionally test my single page apps under 3g connections to see how the loading experience works.