5
High
Performance
Verified by measurement
Heavy third-party script load
The homepage loads 160 scripts, which is the usual root cause of slow interaction readiness on mobile.
scroll ↕ — this is the live page
⚠ Heavy third-party script loadThe homepage loads 160 scripts, including 78 inline and 82 external, totaling 2239 KB of HTML. This heavy third-party script load is the usual root …
Defer non-critical scriptsRemove duplicate pixelsReduce script count
Performance
Homepage
Audited and deferred non-critical scripts.
- Critical scripts only
- Deferred non-critical
- Removed duplicates
✓ Faster loadDeferring non-critical scripts improves interaction readiness.
FixAudit and defer scripts by identifying which third-party tags are essential for core functionality and which can be loaded asynchronously or deferred. Remove duplicated analytics or marketing pixels to reduce the total script count. This will decrease the time to interactive, making the page feel faster and more responsive, thereby improving user experience and conversion rates.
Evidence
Observed on the live site Verified by measurement
✓ Flagged independently by 1 of 7 analysts
- Measured on the live homepage: 78 inline and 82 external <script> tags, 2239 KB of HTML.
Business case
If this change wins
0.2 – 1.0
orders per 1,000 visitors
Medium
Effort — 2-5 days
Not A/B testable
At typical traffic
Detecting this needs about 315,206 visitors per variant. Ship it as a sequenced change and log the date instead.
Prioritisation
PXL score: 5 / 10
Assessed from the live page
| Question | Answer | Points |
|---|---|---|
| Is the change above the fold? | Yes | 1 |
| Is the change noticeable in under 5 seconds? | Yes | 2 |
| Does it add or remove an element? | Yes | 1 |
| Does it run on a high-traffic page? | No | 0 |
| Verified by direct technical measurement? | Yes | 1 |
Criteria that need your data
4 of these could not be answered from the live page. Session recordings, survey or support themes, and analytics access would raise the confidence of this ranking — they do not indicate a weaker finding.
| Question | Answer | Points |
|---|---|---|
| Discovered via user testing? | No | 0 |
| Discovered via qualitative feedback (survey, support)? | No | 0 |
| Supported by heatmaps or session recordings? | No | 0 |
| Found via digital analytics or real-user field data? | No | 0 |
Implementation
Hand this to your developer
- Surface
- Performance — SITE-WIDE PERFORMANCE
- Problem
- The homepage loads 160 scripts, which is the usual root cause of slow interaction readiness on mobile.
- Current state
- notes: 160 scripts, 2239 KB HTML
- Change
- notes: Audit third-party tags, defer non-critical scripts, and remove duplicated analytics or marketing pixels.
- Acceptance criteria
- GIVEN a first-time visitor on the affected page
WHEN the change is live
THEN Audit third-party tags, defer non-critical scripts, and remove duplicated analytics or marketing pixels, with no regression at 375px and 1280px widths. - Tracking
- event: cro_heavy_third_party_script_load on interaction with the changed element; verify it fires in BOTH variants before opening traffic.
- Success metric
- conversion rate on the affected step
- QA checklist
- Chrome / Safari / Firefox · 375px + 1280px · keyboard reachable · screen-reader name present · no CLS introduced
- Effort
- Medium — 2-5 days
- Test plan
- 315,206 visitors per variant (95% significance, 80% power); duration depends on traffic.
- Rollback
- Feature-flag the change; revert the flag if the primary metric drops for 3 consecutive days.