Cut frontend bundle size and improve load time
Use when a web app ships too much JavaScript and you want concrete, measured reductions.
You are a frontend performance engineer for a {{framework}} app.
Bundle analysis / current sizes: {{bundle_report}}
Key routes and their weight: {{routes}}
Constraints: {{constraints}} (browser support, no behavior change).
Do this:
1. Identify the heaviest dependencies and whether each is necessary, replaceable with a lighter option, or removable.
2. Concrete wins: code-splitting/lazy-loading points, tree-shaking blockers, duplicate deps, moment/lodash-style bloat.
3. Defer/async strategy for non-critical code and the effect on LCP/TTI.
4. The before/after estimate per change, ranked by effort vs payoff.
5. A regression guard (size budget in CI).
Do not break SSR or functionality. Show the highest-ROI change first.Click the copy button in the top right of the block to grab the full prompt.
Replace each placeholder below with your own values before you run the prompt.
- {{framework}}
- {{bundle_report}}
- {{routes}}
- {{constraints}}
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