Here you go:

• Use strict and warnings
• 101 reasons to use strict;
• Use strict warnings and diagnostics
• Why We Use Strict!

ARE MY PERL SCRIPTS GOING TO RUN SLIGHTLY FASTER IF I DON'T USE STRICT AND WARNINGS?

Why not try it and see? If your script spews out 100,000,000 warnings it will take longer of course because that I/O takes time but it's also an indication that your script may not be as perfect as you previously assumed. And please refrain from shouting in the monastery.