At under 1KB gzipped, DataFast keeps tracking outside your critical rendering path while preserving source-to-revenue attribution.
5,000 events/month free. No credit card required.
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Gzipped script
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Non-blocking load
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Render blocking
The production tracker is under 1KB gzipped and loaded asynchronously. Every byte counts for page speed.
DataFast loads asynchronously and does not render UI, helping it stay out of layout and rendering work.
Keep your LCP, FID, and CLS scores pristine. Our script loads asynchronously and never touches the DOM, so your Core Web Vitals stay exactly where they are.
A single self-contained script with zero dependencies. No tag managers, no additional libraries, no third-party requests that slow down your page.
The script is served from a global CDN edge network. Sub-10ms load times from anywhere in the world, cached aggressively at the browser level.
Despite the tiny size, you get pageviews, custom events, UTM tracking, referral sources, and revenue attribution. No features sacrificed for performance.
It does not try to replicate all of GA. DataFast focuses on the metrics that actually matter: pageviews, visitors, sources, events, and revenue. The heavy processing happens server-side, keeping the client script minimal.
The script loads asynchronously and is under 1KB gzipped, keeping its download and execution footprint small. Measure your own site before and after installation because performance varies by page.
No. It intentionally focuses on pageviews, campaigns, custom events, and the visitor reference needed for revenue attribution.
No. DataFast moves data processing to the server side. The client script only captures and sends events. You get pageviews, custom events, UTM tracking, revenue attribution, and real-time dashboards despite the tiny script size.
Yes. The script works with any website: static HTML, WordPress, React, Next.js, Vue, Svelte, and more. For SPAs, it automatically detects route changes without any additional configuration.
Absolutely. View the source of our tracking script directly in your browser DevTools. It is unminified and readable. You can verify every byte and confirm there is no hidden tracking or bloat.