Best Car Dealership Websites in O'Fallon, MO
6 dealership websites in O'Fallon, ranked by how fast and stable they are for real shoppers. O'Fallon averages 81, level with the Missouri average. Jim Trenary Group Site leads at 96. Updated Oct 17, 2026.
- Sites ranked
- 6
- Average score
- 81
- ±0 vs Missouri (81)
- Scoring good
- 33%
- 2 sites above 80
- Top score
- 96
- Jim Trenary Group Site
Dealership websites in O'Fallon
| RANK | DEALERSHIP | SCORE |
|---|---|---|
| 1 | 96 | |
| 2 | 82 | |
| 3 | 80 | |
| 4 | 79 | |
| 5 | 74 | |
| 6 | 73 |
The O'Fallon market
Website providers in O'Fallon
Bars show share of ranked sites; the number is each provider's average score. 1 site with no detected provider.
Score spread
- Good81–100233%
- Needs improvement61–80467%
- Poor0–6000%
Median score 79
Nearby cities
The closest cities with ranked dealership websites.
More cities in Missouri
How the rankings work
Each website's score (0–100) comes from Google's Chrome UX Report — what real Chrome users experienced over a roughly 28-day window. It weights five field metrics at the 75th percentile: Largest Contentful Paint, Cumulative Layout Shift, Interaction to Next Paint, First Contentful Paint and Time to First Byte. Above 80 is good, 61–80 needs improvement, 60 or less is poor.
It measures website performance, not a dealership's sales or service. Active dealership websites with enough Chrome traffic to be measured are ranked; the rest aren't scored rather than scored low.