c15t Next.js Offline – Throttled benchmark
@c15t/nextjs@2.2.1 (offline)
Self-hosted npm
This page shows c15t Next.js Offline 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 Offline scored 80/100 (Good) and ranked 4th of the 12 tested installations. The banner appeared in 1.7 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 432 ms (FCP) and added 15 ms of Total Blocking Time (TBT), and the banner covered 9.0 % of the first viewport (viewport coverage).
Score and composition
80Good · ±0.1
throttled mobile · cold cache · p75 of 20 loads
CategoryWeightageScore
Banner Speed30 %65
Page Impact25 %92
Network Cost25 %82
Visitor Experience20 %87
Time to banner
1.7s
±4 ms across loads
First-paint delay
432ms
Beyond the control's 217 ms · TBT +15 ms
Transferred
58.8KB
Beyond the control's 135.9 KB · +2 requests
Viewport blocked
9.0%
Of the first viewport · clickable 66 ms later
20 loads · time to banner
1.7 smedian 1.7 s1.8 s
Where it sits in the field · 12 installations
60
80
0this provider · 80100
How the banner lands · p75 load
Document
649 msto first paint
Consent request
none · in the bundle
—no extra requestScript executes
1.3 sconsent layer
Banner visible
1.7 sfrom navigation start
LCP 649 ms · 432 ms later than the controlbanner 1.7 s · covers 9.0%
Across conditions · p75 per condition
| Condition | Score | Rank | Time to banner | Transferred | Viewport blocked | LCP |
|---|---|---|---|---|---|---|
| fast-desktop · cold | 92Good | 3 / 12 | 199ms | 58.8KB | 9.0% | 72ms |
| throttled-mobile · cold | 80Good | 4 / 12 | 1.7s | 58.8KB | 9.0% | 649ms |
Reported, not scored Does not affect the number
DeliverySelf-hosted npm
Package@c15t/nextjs@2.2.1 (offline)
Framework of the test appNext.js 16.3.4
LanguageTypeScript / JavaScript
Bundle typeApp-bundled package
SDK licenceNot recorded
Open source SDKNot recorded
Deployed23 Sep 2026
Loads in this run20 per condition · 2 conditions