Apologies for ad-hominem, my bad. However you saying "serious" developers is also No True Scotsman in some ways!
Anyway, 4GB of RAM on windows is terrible but on a Mac it's not that bad. Builds and page loads rely mostly on CPU and HDD speed and with my comparison with the latest Mac there is not much difference. The only difference is in the amount of resources you can have open at the same time which I agree sometime is annoying but doesn't really slow me down.
Even so, developers get paid but they live in different locations which means different level of income but hardware prices are mostly same anywhere. It's of course a problem but I don't want to continue this argument. I think there shouldn't be any expectation from the developers of tools for users to buy new hardware to be considered serious. At the moment most of the developments are put into electron based apps which are just simply inefficient but cheaper to develop and the responsibility of handling the burden is on the user to buy better hardware. I just think it's not fair to those who can't afford and should go back to the less progressive tools like sublime, same as the teammates of OP.
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