Impact of Fibr Script on Web Performance
every script you add to your website affects performance we know that slower pages mean lower conversions, so we've engineered the fibr script to be as lightweight as possible to show you exactly what that means, we ran a head to head comparison of fibr against other popular personalization tools vwo, kameleoon, and mutiny here's what we found performance comparison we measured four key metrics that directly affect user experience and core web vitals scores lower impact percentages are better overall performance score tool without script with script impact fibr 68 6 61 9 9 77% vwo 68 6 58 0 15 45% kameleoon 68 6 57 2 16 62% mutiny 68 6 58 5 14 72% fibr's impact is 35 40% lower than competitors first contentful paint (fcp) fcp measures how quickly the first visible content appears faster is better for perceived load speed tool without script with script impact fibr 0 91s 0 99s +8 79% vwo 0 91s 1 15s +26 37% kameleoon 0 91s 1 11s +21 98% mutiny 0 91s 1 14s +25 27% fibr adds less than 0 1 seconds competitors add 0 2 seconds or more largest contentful paint (lcp) lcp measures when the largest visible element finishes loading this is a core web vital that affects your seo tool without script with script impact fibr 1 92s 2 21s +15 10% vwo 1 92s 2 31s +20 31% kameleoon 1 92s 2 15s +11 98% mutiny 1 92s 2 60s +35 42% fibr stays competitive on lcp, with kameleoon slightly ahead on this specific metric total blocking time (tbt) tbt measures how long the main thread is blocked, preventing user interaction lower is better for responsiveness tool without script with script impact fibr 481ms 587ms +22 04% vwo 481ms 726ms +50 94% kameleoon 481ms 953ms +98 13% mutiny 481ms 575ms +19 54% fibr and mutiny are close here, while kameleoon nearly doubles blocking time the bottom line no personalization script has zero impact, but fibr consistently ranks in the top two across all performance metrics in most cases, the difference is significant competitors often add 2 3x more overhead than fibr we're continuing to optimize our goal is to make the performance impact negligible so you can personalize confidently without sacrificing speed tips to maximize performance even with fibr's lightweight script, you can further minimize impact place the script at the top of your \<head> tag this ensures it loads early and doesn't compete with other resources avoid installing via google tag manager gtm adds latency that can increase fcp and cause flickering direct installation is faster use the anti flicker snippet if needed available in your setup dashboard, this prevents the flash of original content before personalization loads keep your \<head> clean the fewer scripts competing for the main thread, the better your overall performance