Dude, Aero does so little on your performance. Don't even worry about it. Aside from that, you can't really use Aero for it to impact your performance during games. even though the aero is not seen it is still drawn and affects performance.

Does disabling Aero increase FPS?

Disabling Aero could improve the performance because the dwm.exe (Desktop Windows Manager) takes up 28-58000k memory usage. When we disable Aero i.e go back to classic mode, you will find a performance difference. ... And the animation that gets disabled when we disable Aero will impact in loading Menus faster.

How can I improve my Windows Aero performance?

Aero performance is directly related to the graphic chip capabilities. Such a low figure would indicate you most likely are using the on board graphics interface. If it is a full desktop then the simplest option would be to install an add on graphics card as even a fairly basic one should be able to better that score.