[Ignitionnet]

Two big problems with PC games for sure.

The perhaps sometimes unfair perception that if in doubt developers just bump the recommended specifications up a bit rather than optimizing their code is one of them.

Another one, less well known, is that occasionally DRM is implemented really badly and causes a huge performance hit. Imagine taking 1+1 = 2, turning it into something ridiculously complex like SQRT(((SQRT(10*10))*2)/5) = 2 and you get an idea of the performance overhead that can be introduced.