Skip to main contentHow fast does the banner appear?
7.52 s
Median of 15 visits.
All 6 integrations, best first
- Script tag7.52 s
- React7.54 s
- Astro7.67 s
- Nuxt7.68 s
- TanStack Start7.85 s
- Next.js7.95 s
KetchKetchKetch cookie banner: speed and features
In our tests with its Script tag integration, Ketch showed its cookie banner in a median 7.52 s on an emulated mid-tier phone. It delayed the main content by 1.90 s. Accept responded in 32 ms and Reject in 32 ms. It held trackers back in all 4 consent checks.
On desktop, the banner took 1.65 s. Per vendor docs, Ketch supports IAB TCF, IAB GPP, Google Consent Mode v2, Google CMP certification and Global Privacy Control.
How fast is Ketch’s cookie banner?
On Script tag. We measured other CMPs on Next.js only, so this comparison uses Ketch’s other integrations.
Does it slow the page down?
+1.90 s
Compared with the same page without a consent manager. There were too few paired visits to calculate an interval.
All 6 integrations, best first
- React1.62 s
- Next.js1.74 s
- Nuxt1.75 s
- TanStack Start1.75 s
- Script tag1.90 s
- Astro1.95 s
How fast does a click respond?
32 msOne visit measured
Reject responded in 32 ms. Under 200 ms feels instant.
All 6 integrations, best first
- Nuxt32 ms
- TanStack Start32 ms
- React32 ms
- Script tag32 ms
- Next.js40 ms
- Astro40 ms
Does it block trackers until consent?
4 of 4consent checks passed
No tracker ran and the page set no cookie before the visitor chose.
All 6 integrations, best first
- Next.js100%
- Nuxt100%
- Astro100%
- TanStack Start100%
- React100%
- Script tag100%
Which standards and features does Ketch support?
Each status comes from Ketch’s documentation. CookieBench does not test these features unless a line says so.
- Verified by test
- Per vendor docs
- Partial
- Not supported
- Unknown
| Feature | Status |
|---|---|
| IAB TCF | TCF v2.2 (vendor documentation, opens in a new tab) |
| IAB GPP | Per vendor docs (vendor documentation, opens in a new tab) |
| Google Consent Mode v2 | Per vendor docs (vendor documentation, opens in a new tab) |
| Google-certified CMP | Per vendor docs (vendor documentation, opens in a new tab) |
| Global Privacy Control | Per vendor docs (vendor documentation, opens in a new tab) |
| Feature | Status |
|---|---|
| Geo-targeted banners | Per vendor docs (vendor documentation, opens in a new tab) |
| Script blocking | Tag orchestration (vendor documentation, opens in a new tab) |
| Consent records | Per vendor docs (vendor documentation, opens in a new tab) |
| Cookie scanning | Per vendor docs (vendor documentation, opens in a new tab) |
| Feature | Status |
|---|---|
| Open source | SDKs and samples only (vendor documentation, opens in a new tab) |
| Self-hostable | Hosted service (vendor documentation, opens in a new tab) |
| Headless UI | Per vendor docs (vendor documentation, opens in a new tab) |
| TypeScript types | Per vendor docs (vendor documentation, opens in a new tab) |
| Feature | Status |
|---|---|
| Free tier | 5,000 users (vendor documentation, opens in a new tab) |
Which frameworks does Ketch support?
- First-party SDKs
- None
- Script tag
- Supported
- Measured in this run
- Script tag, React, Next.js, Nuxt, Astro and TanStack Start
Support per Ketch’s documentation.
Ketch’s results by framework, mobile (emulated)
Each row is a separate app. We measured each one against the same app without a consent manager. The rows compare integrations, not frameworks.
| Framework | Banner appears | Page slowed by | Click responds in | Trackers blocked |
|---|---|---|---|---|
| Script tagShown above | 7.52 s | +1.90 s | 32 msOne visit measured | 4 of 4 passed |
| React | 7.54 s | +1.62 s | 32 msOne visit measured | 4 of 4 passed |
| Next.jsShared with every CMP | 7.95 s | +1.74 s | 40 msOne visit measured | 4 of 4 passed |
| Nuxt | 7.68 s | +1.75 s | 32 msOne visit measured | 4 of 4 passed |
| Astro | 7.67 s | +1.95 s | 40 msOne visit measured | 4 of 4 passed |
| TanStack Start | 7.85 s | +1.75 s | 32 msOne visit measured | 4 of 4 passed |
Were there problems testing Ketch?
We show each missing answer as missing, never as zero.
Desktop
- Its remote script or config changed during the run, so the run gives no confidence intervals for this cell. Differences are medians only.
Mobile (emulated)
- Its remote script or config changed during the run, so the run gives no confidence intervals for this cell. Differences are medians only.
When does Ketch load, and what does it cost the page?
Lab detail for engineers. All Core Web Vitals are here. The summary leaves some of them out.
When does Ketch start loading?
The banner was visible at 7.52 s. The published results do not show when Ketch started to load.
| Event | Time from navigation |
|---|---|
| First byte (TTFB) | 2 ms |
| First paint (FCP) | 244 ms |
| Largest paint (LCP) | 4.77 s |
| Banner visible | 7.52 s |
| CMP requested | |
| CMP loaded | |
| Consent state known |
How do page vitals compare with no consent manager?
Each row shows the value on the page with the consent manager. It also shows how far the value moved from the same page without one.
| Measure | With Ketch | Difference |
|---|---|---|
| TTFBTime to first byte | 2 ms | +0 msNo interval reported |
| FCPFirst Contentful Paint | 244 ms | +8 msNo interval reported |
| LCPLargest Contentful Paint | 4.77 s | +1.90 sNo interval reported |
| CLSCumulative Layout Shift | 0.00 | 0.00No interval reported |
| Primary content paintThe page’s main content, not the banner | 4.77 s | +1.90 sNo interval reported |
What was the largest element on screen?
LCP times the largest element on screen. If that is the banner, LCP measures the banner instead of the page.
There is no LCP attribution for this profile and framework.
What happens after a visitor clicks Accept?
The screen responded to Accept in 32 ms.
| Event | Time from the click |
|---|---|
| Screen responds | 32 ms |
| Banner gone | |
| Consent applied | |
| Analytics active |
How much does it download?
Initial transfer happens before the page settles. Deferred transfer comes after.
| Measure | With Ketch | Difference |
|---|---|---|
| Initial transferBytes before the page settles | 1.03 MB | +532 KBNo interval reported |
| Deferred transferBytes loaded later | Not compared | |
| RequestsAll requests | 15 | +9No interval reported |
| Third-party requestsRequests to other hosts | 9 | +9No interval reported |
Does it block the main thread?
Long tasks are stretches over 50 ms when the page cannot respond to taps or keys.
| Measure | With Ketch | Difference |
|---|---|---|
| Long-task timeBlocking time during load | 976 ms | +976 msNo interval reported |
What do returning visitors see?
A visitor who accepted on an earlier visit comes back. We check that the banner stays hidden.
- Banner stayed hidden
- Consent state known at
What was tested?
- Methodology
- cookiebench-v3.2.4
- Analysis
matrix-2026-10-11
On desktop, it appeared in a median 1.68 s, against 471 ms for the median of the 10 CMPs measured. On an emulated mid-tier phone, it appeared in a median 7.95 s, against 2.71 s for the median of the 10 CMPs measured.
On desktop it delayed the main content by 0 ms. On an emulated mid-tier phone it delayed the main content by 1.74 s. Delay is the extra time before the main content appears. We compare Largest Contentful Paint on the same page, with and without a consent manager.
It passed 4 of 4 checks on desktop and on an emulated mid-tier phone. A check fails if a tracker runs, the page sets a cookie or data leaves the page before the visitor chooses.
Per vendor docs, Ketch supports IAB TCF, IAB GPP, Google Consent Mode v2, Google CMP certification and Global Privacy Control. Feature support comes from Ketch’s documentation. CookieBench did not test these features itself.
