Lot of developers don't care about performance at all. Knuth must be regretting his life choices when he knows webshits write O(n²) code when O(n) code would be

Lot of developers don't care about performance at all. Knuth must be regretting his life choices when he knows webshits write O(n²) code when O(n) code would be equally straightforward, and allocate memory gratiously, misquoting "premature optimization is root of all evil". Most of them also have latest hardware and don't know the user experience / business consequences of this. Lack of knowledge of proper computer science fundamentals among blue collar developers is also a reason for this.