This cannot be said enough. I do not like talking about the past a lot as that is useless but yes: I did make a lot of complex apps natively on unix and windows machines many years ago and recently for fun or symbos: if you make similar apps on current system with web tech the cpu gets a massive hit for things that should not even be moving the needle. And on native tech it doesn't: but on tcl/tk it does not either which is not native.

I know this is the future, but with my job in which I do a lot of embedded software and mobile software next to web stuff, the web stuff really seems to be the cpu and memory killer which in turn drain the battery very fast.

Not sure if there is a solution if the biggest companies in the world cannot prevent their applications from doing that though.