# What is Bundle Size? | Yungle glossary

> Bundle size is the total weight of the JavaScript and CSS a browser must download to render a page.

Source: https://yungle.ai/glossary/bundle-size/

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Glossary · B

# Bundle Size

In plain words

Bundle size refers to the combined file size of the JavaScript, CSS, and other assets a browser downloads to load a page. Smaller bundles load faster, which directly improves Core Web Vitals, page speed, and ultimately search rankings and conversion rates.

Example

Removing an unused animation library takes a page's JavaScript from 400 KB to 90 KB, and it becomes interactive about a second sooner on mobile.

Related resources

-   Glossary

    ## Core Web Vitals

    Core Web Vitals are Google's three key metrics for measuring real-world page loading and interactivity.

    [See term](https://yungle.ai/glossary/core-web-vitals)
-   Insight

    ## Core Web Vitals for B2B Websites Explained

    What Core Web Vitals measure, the thresholds Google uses, and how to build a B2B website that stays fast after launch instead of fixing it later.

    [Read insight](https://yungle.ai/insights/core-web-vitals-for-b2b-websites)
-   Glossary

    ## Custom Code Embed

    A custom code embed lets you inject raw HTML, CSS, or JavaScript into a Webflow page or element.

    [See term](https://yungle.ai/glossary/custom-code-embed)
-   FAQ

    ## How Fast Should My Website Load?

    Aim for under 2.5 seconds for your largest content element to load (Largest Contentful Paint) — anything past 3 seconds starts costing you visitors and search rankings. Speed is both a ranking factor and a conversion factor — every extra second of load time measurably increases bounce rate. Heavy images, unoptimized code, and bloated third-party scripts are the usual culprits. A well-built site loads fast by default.

    [See answer](https://yungle.ai/resources?type=faq#how-fast-should-my-website-load)
-   FAQ

    ## How Much Should I Budget for Digital Marketing Monthly?

    Most growing businesses budget 7-10% of revenue for marketing overall, with website and SEO typically making up $2,000 to $8,000+ per month depending on growth goals and competitiveness. Budget should scale with ambition, not just company size. A business trying to double revenue in a year needs a heavier marketing investment than one maintaining steady growth. Track spend against pipeline and revenue generated, not just activity, to know if the budget is right.

    [See answer](https://yungle.ai/resources?type=faq#how-much-should-i-budget-for-digital-marketing-monthly)

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