How heavy is each tracking script? Browse our database of 50+ third-party scripts with exact transfer sizes, privacy risk ratings, cookies set, and lighter alternatives. Sortable, searchable, no scanning required.
Why Script Size Matters
Every kilobyte of JavaScript your page loads has a real cost: bandwidth, parse time, and main thread execution time. Third-party trackers are especially impactful because they also require DNS lookups, TLS handshakes, and often load additional sub-resources dynamically.
For example, replacing Google Analytics (46 KB + GTM 82 KB = 128 KB) with Plausible (1 KB) saves 127 KB per page load and eliminates the need for a consent banner entirely — removing another 40-65 KB of CMP script weight.
How We Measure Script Weight
Transfer size is the compressed (gzip/brotli) size sent over the network — this is what affects load time. Decoded size is the uncompressed size the browser must parse and execute — this affects CPU time. Both are measured using Chrome DevTools Protocol on real page loads.