Scaling Shopify During Flash Sales: What Actually Breaks (And How to Fix It)

Flash sales are brutal stress tests for your Shopify store. You spend weeks building hype, send the email blast, and within 60 seconds — your site slows to a crawl. Checkouts time out. Customers leave. Revenue disappears. The frustrating part? Shopify's infrastructure is not the problem. The real culprits are things you control: Third-party app scripts loading on every page Unoptimized Liquid code blocking render Checkout flows never tested under concurrent load Inventory sync apps that fail whe