How to Increase Unity Game Performance

I found a nice article giving some tips to optimize your game made with Unity.

for the audio performance here is a rule of thumb:

• Short Clips – Native
• Longer (or looping) clips – compressed in memory
• Music – Stream from disc
• Files which consistently cause CPU spikes – Decompress on load

sİNCE only one hardware audio stream can be decompressed at a time. Follow the rules above to cause CPU spikes. 

also be sure to check the full article on:
http://www.paladinstudios.com/2012/07/30/4-ways-to-increase-performance-of-your-unity-game/