Running multiple stores, websites, or store views on a single Magento 2 instance is one of the platform's biggest strengths. One codebase, one admin, one database — shared infrastructure for multiple brands, languages, or regions. But multistore setups come with hidden performance traps. The same features that make them flexible — scoped configuration, separate price rules, store-specific catalog data — can silently murder your response times if you're not careful. This guide covers the architecture decisions and practical optimizations that keep a multistore Magento 2 installation running fast. How Magento 2 Resolves Store Context Before optimizing, you need to understand the performance cost of store resolution itself.…