The Vue 3 Reactivity Trap: Why Large Datasets Crash Your Browser

Vue 3's reactivity system uses ES6 Proxies to deeply wrap every object property, which causes severe performance issues with large datasets (e.g., 50,000 items) by creating hundreds of thousands of Proxies that block the main thread and balloon memory usage. The article recommends using shallowRef to opt out of deep reactivity when individual property mutation isn't needed, and markRaw for mixed reactive state, reducing processing time from hundreds of milliseconds to single digits.