c15t Next.js – Throttled benchmark
@c15t/nextjs@2.2.1
Hosted backend
This page shows c15t Next.js under the throttled-mobile profile, which applies a 4× CPU slowdown, 1,638 kbps down, 750 kbps up and 150 ms of added latency to simulate slower conditions; it does not emulate a phone screen. Every load is cold, and each figure is the p75 of 20 loads in the run of 24 Sep 2026. c15t Next.js scored 72/100 (Fair) and ranked 7th of the 12 tested installations. The banner appeared in 2.8 s (time to banner) and the page transferred 58.8 KB more than the no-SDK control (bytes over the wire). It delayed first paint by 441 ms (FCP) and added no Total Blocking Time (TBT), and the banner covered 9.0 % of the first viewport (viewport coverage).
Score and composition
72Fair · ±0.3
throttled mobile · cold cache · p75 of 20 loads
CategoryWeightageScore
Banner Speed30 %45
Page Impact25 %93
Network Cost25 %74
Visitor Experience20 %87
Time to banner
2.8s
±36 ms across loads
First-paint delay
441ms
Beyond the control's 217 ms · TBT +0 ms
Transferred
58.8KB
Beyond the control's 135.9 KB · +6 requests
Viewport blocked
9.0%
Of the first viewport · clickable 65 ms later
20 loads · time to banner
2.7 smedian 2.7 s2.8 s
Where it sits in the field · 12 installations
60
80
0this provider · 72100
How the banner lands · p75 load
Document
658 msto first paint
Consent request
990 msvendor script
Script executes
1.3 sconsent layer
Banner visible
2.8 sfrom navigation start
LCP 658 ms · 441 ms later than the controlbanner 2.8 s · covers 9.0%
Across conditions · p75 per condition
| Condition | Score | Rank | Time to banner | Transferred | Viewport blocked | LCP |
|---|---|---|---|---|---|---|
| fast-desktop · cold | 83Good | 7 / 12 | 1.2s | 58.8KB | 9.0% | 83ms |
| throttled-mobile · cold | 72Fair | 7 / 12 | 2.8s | 58.8KB | 9.0% | 658ms |
Reported, not scored Does not affect the number
DeliveryHosted backend
Package@c15t/nextjs@2.2.1
Framework of the test appNext.js 16.3.4
LanguageTypeScript / JavaScript
Bundle typeApp-bundled package
SDK licenceApache-2.0
Open source SDKYes (package license)
Deployed15 Sep 2026
Loads in this run20 per condition · 2 conditions