I have family members who buy new computers every few years just so they can play web-based games on Facebook with reasonable performance. This is quite underst

I have family members who buy new computers every few years just so they can play web-based games on Facebook with reasonable performance. This is quite understandable given how poorly the Facebook website performs even with modern browsers with modern JavaScript engines but on older hardware. This IMHO is one of the dark side of JavaScript -- it may 'run everywhere' but it certainly doesn't perform well everywhere. It does not matter other sites work (e.g. HN) work just fine on older hardware, the Joe Public just want Facebook, Gmail, etc to work.