Black Friday is the only peak in the IT calendar that we know years in advance. The date is fixed, the marketing plan is approved months ahead, and every retailer expects record traffic. Yet every year, well-known brands greet customers with error pages, waiting screens, and broken checkouts. In the past, a slow website was an inconvenience. Today, a few hours of downtime on Black Friday or Cyber Monday can cost millions in sales, push loyal customers to competitors, and dama