4
Urgent
Performance
Verified by measurement
LCP 9.3s on MLB
Lab LCP on /en-us/sports/mlb is 9.3s, far above the 2.5s good threshold, causing most mobile visitors to bounce before content appears.
scroll ↕ — this is the live page
⚠ LCP 9.3s on MLBThe page's Largest Contentful Paint is 9.3 seconds on mobile, far exceeding the 2.5s 'good' threshold. This means the main content (likely a hero …
Preload hero imageDefer non-critical JSUse WebP imagesSet image dimensions
Performance
MLB Scores & Schedule
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✓ Fast loadMain content appears in under 2.5s.
FixOptimize the largest content element by preloading the hero image and deferring non-critical scripts. Implement responsive image sizing with modern formats (e.g., WebP) and set explicit dimensions to avoid layout shifts. This should bring LCP under 2.5s, improving perceived performance and reducing bounce rate.
Evidence
Observed on the live site Verified by measurement
✓ Flagged independently by 1 of 7 analysts
- Lighthouse (mobile emulation, single synthetic run via DataForSEO): Largest Contentful Paint 9.3 s against a ‘good’ threshold of 2500ms. Lab data, not real-user field data — confirms the defect class, not the field percentile.
Business case
If this change wins
0 – 0
orders per 1,000 visitors
Medium
Effort — 2-5 days
Not A/B testable
At typical traffic
Detecting this needs about 124,891 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 — PERFORMANCE
- Problem
- Lab LCP on /en-us/sports/mlb is 9.3s, far above the 2.5s good threshold, causing most mobile visitors to bounce before content appears.
- Current state
- notes: Largest Contentful Paint 9.3 s (lab, mobile on /en-us/sports/mlb)
- Change
- notes: Largest Contentful Paint ≤ 2500ms (good)
- Acceptance criteria
- GIVEN a first-time visitor on the affected page
WHEN the change is live
THEN Largest Contentful Paint ≤ 2500ms (good), with no regression at 375px and 1280px widths. - Tracking
- event: cro_lcp_9_3s_on_mlb 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
- 124,891 visitors per variant (95% significance, 80% power); 56 days.
- Rollback
- Feature-flag the change; revert the flag if the primary metric drops for 3 consecutive days.