Bad cable and wire arrangement interfer with pc performance?

I never noticed before but my pc desktop is crap, especially the cables and wiring, can this interfere with my computer or am i just being paranoid?

Your not paranoid, well at least not fully

Bad cable management can defiantly interfere with the ability to disperse heat inside your case, and can lead to loss of performance. Best thing to do is try to zip-tie your cables together in bunches, and then zip-tie those to a spot in your case out of the way. Just be careful not to pull on them, or place them in the way of any fans.

Oh, and make sure your computer is off and un-plugged when doing this.

Btw just to make my self clear im not talking about inside the case, its outside where all the components are, moniyor, keyboard, mouse, tower, printer, and, speakers. Thanks for the answers