[Xeoncross]

Removing millions of lines of code does speed up your application. Removing react and the 100 NPM modules helps. Removing Java and the 100 Jar files helps. Removing Django/Laravel/Rails/etc... helps reduce calculations and memory.

There are a lot of instruction abstraction layers that just aren't needed. Older games are a great example. I am still amazed at the size of the modern StarCraft, Rollercoaster Tycoon, or CS:GO executables with all the new layers of emulation and compatibility stuff. Sometimes even 10x the original size.

However, there are ways to use libraries like react (preact.js anyone?) without a dozen plugins and a huge runtime layer. Look at HTMLX, the new cool kid that was originally an XHR request that inserts document.querySelector(name).innerHTML = response and is now a large package of 145KB of JavaScript.

Part of the issue is the growth of these frameworks and part is that the developers don't know how to use them in performant ways. They're just trying to ship stuff, performance is optional.