If I may be honest without offending you...
You need a
finishing touch on those wires.
The motherboard power will always present a problem from a cabling standpoint. However, most everything else can be contained in some wire tubing (as linked above) that really makes a world of difference.
Re: performance
Your current wiring opens up the airflow nicely so any additional management will have minimal gains in performance, but if you're like me with wiring (OCD!!), then I think you'll appreciate the above or similar solutions.