Client: You & Us Mechanical — AC and HVAC repair, New York City.
Challenge
You & Us Mechanical's site was failing Core Web Vitals badly — a GTmetrix grade of F with just 41% performance — which meant slow load times were actively working against both user experience and search rankings for a business that depends on people finding it fast during an AC or heating emergency.
Approach
- Diagnosed the specific causes of slow Largest Contentful Paint and high Total Blocking Time
- Rebuilt image delivery and reduced render-blocking resources
- Cleaned up on-page SEO structure — meta titles, descriptions, and heading hierarchy — around real service and location terms
- Re-tested and monitored performance monthly until the site held a stable A grade
Result
F → A
GTmetrix Grade
41% → 99%
Performance
4.0s → 646ms
Largest Contentful Paint
87%
SEO Score
In March 2022 the site graded an F, with a 4.0-second Largest Contentful Paint actively hurting both user experience and rankings.
By August, the same site held a GTmetrix A grade with 99% performance and a 646ms Largest Contentful Paint — a completely different site from a Core Web Vitals standpoint, with the on-page SEO score up to 87%.
