Skip to main contentHow fast does the banner appear?
558 ms
Median of 15 visits.
All 6 integrations, best first
- Script tag558 ms
- TanStack Start637 ms
- Next.js644 ms
- React647 ms
- Astro649 ms
- Nuxt671 ms
OsanoOsanoOsano cookie banner: speed and features
In our tests with its Script tag integration, Osano showed its cookie banner in a median 558 ms on desktop. It added no measurable delay to the main content. Accept responded in 40 ms and Reject in 32 ms. It held trackers back in all 4 consent checks.
On an emulated mid-tier phone, the banner took 1.76 s. Per vendor docs, Osano supports IAB TCF, IAB GPP, Google Consent Mode v2, Google CMP certification and Global Privacy Control.
How fast is Osano’s cookie banner?
On Script tag. We measured other CMPs on Next.js only, so this comparison uses Osano’s other integrations.
Does it slow the page down?
No measurable delay95% interval −8 ms to 16 ms
Main content painted as fast as on the same page without a consent manager.
All 6 integrations, best first
- Next.js0 ms
- TanStack Start0 ms
- Nuxt2 ms
- React4 ms
- Script tag4 ms
- Astro12 ms
How fast does a click respond?
40 msOne visit measured
Reject responded in 32 ms. Under 200 ms feels instant.
All 6 integrations, best first
- Next.js32 ms
- Astro40 ms
- TanStack Start40 ms
- React40 ms
- Script tag40 ms
- Nuxt48 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%
- Astro100%
- React100%
- Script tag100%
- Nuxt75%
- TanStack Start25%
Which standards and features does Osano support?
Each status comes from Osano’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 (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 | Paid plans (vendor documentation, opens in a new tab) |
| Consent records | Paid plans (vendor documentation, opens in a new tab) |
| Cookie scanning | Per vendor docs (vendor documentation, opens in a new tab) |
| Feature | Status |
|---|---|
| Open source | Older library only (vendor documentation, opens in a new tab) |
| Self-hostable | Hosted script (vendor documentation, opens in a new tab) |
| Headless UI | Unknown |
| TypeScript types | React Native SDK only (vendor documentation, opens in a new tab) |
| Feature | Status |
|---|---|
| Free tier | About 5,000 pageviews a month (vendor documentation, opens in a new tab) |
Which frameworks does Osano support?
- First-party SDKs
- None
- Script tag
- Supported
- Measured in this run
- Script tag, React, Next.js, Nuxt, Astro and TanStack Start
Support per Osano’s documentation (opens in a new tab).
Osano’s results by framework, desktop
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 | 558 ms | No measurable delay95% interval −8 ms to 16 ms | 40 msOne visit measured | 4 of 4 passed |
| React | 647 ms | No measurable delay95% interval −20 ms to 16 ms | 40 msOne visit measured | 4 of 4 passed |
| Next.jsShared with every CMP | 644 ms | No measurable delay95% interval −20 ms to 20 ms | 32 msOne visit measured | 4 of 4 passed |
| Nuxt | 671 msOnly 14 visits measured | +2 msOnly 14 visits measured | 48 msOne visit measured | 3 of 4 passed |
| Astro | 649 ms | No measurable delay95% interval −4 ms to 32 ms | 40 msOne visit measured | 4 of 4 passed |
| TanStack Start | 637 ms | No measurable delay95% interval −12 ms to 20 ms | 40 msOne visit measured | 1 of 4 passed |
Were there problems testing Osano?
We show each missing answer as missing, never as zero.
Mobile (emulated)
- Accept and reject closed the banner and consent took effect, but a page control clicked 500 ms later did not respond, so those checks failed.
Desktop: no issues recorded.
When does Osano 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 Osano start loading?
The banner was visible at 558 ms. The published results do not show when Osano started to load.
| Event | Time from navigation |
|---|---|
| First byte (TTFB) | 2 ms |
| First paint (FCP) | 44 ms |
| Largest paint (LCP) | 104 ms |
| Banner visible | 558 ms |
| 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 Osano | Difference |
|---|---|---|
| TTFBTime to first byte | 2 ms | No measurable difference95% interval −1 ms to 0 ms |
| FCPFirst Contentful Paint | 44 ms | No measurable difference95% interval −24 ms to 20 ms |
| LCPLargest Contentful Paint | 104 ms | No measurable difference95% interval −8 ms to 16 ms |
| CLSCumulative Layout Shift | 0.00 | No measurable difference95% interval: 0.00 |
| Primary content paintThe page’s main content, not the banner | 104 ms | No measurable difference95% interval −8 ms to 16 ms |
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 40 ms.
| Event | Time from the click |
|---|---|
| Screen responds | 40 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 Osano | Difference |
|---|---|---|
| Initial transferBytes before the page settles | 586 KB | +87 KB95% interval 85 KB to 87 KB |
| Deferred transferBytes loaded later | Not compared | |
| RequestsAll requests | 10 | +4No interval reported |
| Third-party requestsRequests to other hosts | 4 | +4No 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 Osano | Difference |
|---|---|---|
| Long-task timeBlocking time during load | 21 ms | +21 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 644 ms, against 471 ms for the median of the 10 CMPs measured. On an emulated mid-tier phone, it appeared in a median 2.15 s, against 2.71 s for the median of the 10 CMPs measured.
On desktop it added no measurable delay to the main content. On an emulated mid-tier phone it delayed the main content by 424 ms (95% interval 420 ms to 428 ms). 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.
On desktop it passed 4 of 4 checks. On an emulated mid-tier phone it passed 2 of 4 checks. In 2, the accept check failed and the reject check failed. A check fails if a tracker runs, the page sets a cookie or data leaves the page before the visitor chooses.
Per vendor docs, Osano supports IAB TCF, IAB GPP, Google Consent Mode v2, Google CMP certification and Global Privacy Control. Feature support comes from Osano’s documentation. CookieBench did not test these features itself.
