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While we're on it, make sure this is a low end laptop in terms of components too. Make sure your application is usable. No one needs a chat client that eats several gigs of RAM and a significant portion of your CPU.

Yeah, more teams need to do this and consider performance on low-end devices to be a feature.

When Android Kit Kat was under development, the team used nerfed Nexus 4's to simulate a low end Android phone.

https://en.wikipedia.org/wiki/Android_KitKat#Development

Throttle your internet connection or add simulated latency too!

Good call.

I use this https://github.com/mattkersley/Responsive-Design-Testing too, modified with 1366 x 768 as one of the three "key sizes" to design for.

For web, try a 25-dollar or 5-year-old phone.