Background
                            
                            
                                RAM, CPU is getting cheaper nowdays, however, unlimited resources !== unlimited budget. Unoptimzied code will ended up bleed the monthly cost.
                            
                            
                                Objectives
                            
                            
                                to understand how to compute script execution time
                            
                            
                               Deliverables
                            
                            
                                article, source code & illustration