title: for-loop mechanism efficiency tips
body: <p>As I am using for-loops on large multi-dim arrays, any saving on the for-loop mechanism itself is meaningful.</p>
  
  <p>Accordingly, I am looking for any tips on how to reduce this overhead.</p>
  
  <p>e.g. : counting down using uint instead of int and != 0 as stop instead of >0 allows the CPU to do less work (heard it once, not sure it is always true)</p>