[MIRROR] Adds a note about for loop speed (#5267)

* Merge pull request #35154 from Iamgoofball/patch-387

Adds a note about for loop speed

* Adds a note about for loop speed

.github/CONTRIBUTING.md

@@ -306,6 +306,12 @@ Like all languages, Dream Maker has its quirks, some of them are beneficial to u
 
 HOWEVER, if either ```some_value``` or ```i``` changes within the body of the for (underneath the ```for(...)``` header) or if you are looping over a list AND changing the length of the list then you can NOT use this type of for-loop!
 
+### for(var/A in list) VS for(var/i in 1 to list.len)
+The former is faster than the latter, as shown by the following profile results:
+https://file.house/zy7H.png
+Code used for the test in a readable format:
+https://pastebin.com/w50uERkG
+
 
 #### Istypeless for loops
 A name for a differing syntax for writing for-each style loops in DM. It's NOT DM's standard syntax, hence why this is considered a quirk. Take a look at this: