The three metrics
LCP (Largest Contentful Paint) — how fast the main content loads. Usually an image. CLS (Cumulative Layout Shift) — visual stability. Images without dimensions cause jumps. INP (Interaction to Next Paint) — responsiveness. Heavy pages slow everything.How compression helps
Smaller images download faster → better LCP. Proper dimensions → better CLS. Lighter pages → better INP.
Action plan
- Test your site in Google PageSpeed Insights
- Identify the LCP element (often a hero image)
- Compress it with OptimizeImage
- Re-test within minutes
This is the highest-ROI performance fix for most websites.
Use the free image compressor and remove background tools when media is the bottleneck, then validate improvements with the page speed checker.