Q1. When should you use v-if instead of v-show?
v-if conditionally renders: when the expression is falsy the element and its children are not created, and they are destroyed when it flips. It supports v-else and v-else...
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Q2. What is the critical rendering path and how do you optimise it?
The critical rendering path is the sequence the browser follows to turn HTML, CSS and JavaScript into pixels: parse HTML into the DOM, parse CSS into the CSSOM, combine t...
Q3. Why is the key attribute important in v-for?
The key gives each rendered item a stable identity so Vue can match old and new nodes during patching. Without a key, Vue uses an in-place patch strategy and reuses DOM n...
Q4. How do you optimise the performance of a large Vue application?
Practical Vue 3 optimisations: use computed instead of methods in templates so results are cached, and split large components. Prefer shallowRef or shallowReactive for la...