I disagree that everything would be slow. Yeah, there are websites with so many JS bloat that they can make the fans start up in my laptop, but otherwise, your computer does a shitton of things, most of which is essential complexity.
To-the-point software is actually really fast, like gcc/clang does tons of optimizations compared to what compilers did a few decades ago, and I doubt you could realistically optimize it by a significant percentage in the general case. Same for databases. Browsers themselves are also pushing the boundaries of hardware, they can display static HTML/CSS ridiculously fast even though it is not ideal for layouting. Pretty much only the top of the abstractions “suck” sometimes, but there are really fast JS apps as well.
To-the-point software is actually really fast, like gcc/clang does tons of optimizations compared to what compilers did a few decades ago, and I doubt you could realistically optimize it by a significant percentage in the general case. Same for databases. Browsers themselves are also pushing the boundaries of hardware, they can display static HTML/CSS ridiculously fast even though it is not ideal for layouting. Pretty much only the top of the abstractions “suck” sometimes, but there are really fast JS apps as well.