September 20, 2026 · fileo Compress

Image compression and page speed — what actually moves LCP

“Compress images for SEO” is half true. Google uses page experience as a factor. Largest Contentful Paint is often a hero photograph. If that file is 3 MB, compressing it is the highest-leverage change you will make this week. If LCP is a web font or a blocking script, you can TinyPNG the whole media library and the graph will not move.

Measure the hero, not the vibe

In Chrome DevTools, look at LCP element. If it is img or a CSS background, note the transfer size. Cut that file in this tool, deploy, measure again. Write the two numbers down. That paragraph in your changelog is worth more than a blog that says “up to 80%.”

Dimensions beat clever codecs

Serving a 4000-pixel image into a 400-pixel column is the real bug. Resize to the display size (times 2 for retina if you must), then compress. fileo Compress will downscale only when you set a hard target or when a side exceeds 8192 pixels. For layout-sized export, resize in your editor first, then drop it here.

Cache and CDN still matter

A 80 KB WebP on a cold cache across an ocean still feels slow. Compression is not a CDN. Do both. Also set width and height attributes so the page does not jump. None of that happens inside this tab; it happens in your templates.

Lazy loading is not compression

loading="lazy" helps images below the fold. It does nothing for the hero that is LCP. Compress that one first. Lazy-loading a gallery of uncompressed 4 MB PNGs still wrecks people who scroll. Do both jobs; do not confuse them.

Use the compressor for the bytes. Use Lighthouse for whether those bytes were the problem.