Making software is hard, guys. Especially if that software is older even than some designers in this community (including myself, actually). There are people at Adobe who are very interested in improving designers' workflows.

Insulting said people for trying to help you is not the right way to approach this though. Some constructive and respectful criticism would go a long way.

That being said, yes, Photoshop has become increasingly slower over time and is long due for a performance optimization. Especially when it comes to interface responsiveness.