Very much agreed. Like all things balance is needed. Often it's worth thinking about performance during initial design. There's the idea that fixing bugs earlie

Very much agreed. Like all things balance is needed. Often it's worth thinking about performance during initial design. There's the idea that fixing bugs earlier in development is cheaper. This also applies to performance issues. That's not to say you spend an inordinate amount of time focusing on just that, but it needs to be given its due.