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Lightify > Settings > Media Optimizations Images are usually the largest thing on a page and the usual LCP element, which makes this tab the most direct route to a better score.

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Image optimizations

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Pro. Converts the images pages actually use into WebP and swaps them in place, leaving your markup untouched.It covers more than img tags: video posters, picture sources, image preloads, and CSS background images are all handled.Conversion happens progressively as pages are rendered rather than in one pass over your media library, so a large site does not stall. Tune the rate with lightify_webp_images_per_page and the output quality with lightify_webp_quality, which defaults to 82.
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Defers loading images until they are near the viewport. On by default.The first couple of images are excluded automatically, because lazy-loading your hero image delays the exact thing LCP measures. Adjust that count with lightify_lazy_load_above_fold_count.
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Makes images load at correct dimensions so the browser reserves the right space and content does not jump as they arrive. Directly improves CLS.
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Pro. Finds the largest above-the-fold image, which is almost always the LCP element, and tells the browser to fetch it immediately instead of waiting to discover it.LCP is 25% of the performance score, so this is one of the highest-value settings in the plugin.Detection scans the first several images and ignores anything too small to be a hero. Both are filterable: lightify_lcp_scan_images and lightify_lcp_min_image_area.
Preloading and lazy loading fight each other. If your hero is both preloaded and lazy-loaded, the browser fetches it late anyway. Lightify avoids this for the first images on a page, but a hero injected by a page builder can slip past. If LCP is worse than you expect, check whether your hero has a loading="lazy" attribute.

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Video and iframe optimizations

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Defers below-the-fold videos. On by default.
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Defers below-the-fold iframes. On by default, and worth keeping, because embedded content often loads an entire third-party page.
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Pro. Replaces a YouTube embed with its thumbnail, and loads the real player only when someone clicks.A YouTube embed costs several hundred kilobytes and multiple third-party connections before anyone presses play. This removes all of it from your initial load. On a page with several embeds it is often the largest single improvement available.
The player appears on click, so the first play takes slightly longer than with a normal embed. On any page where most visitors never press play, that is a good trade.

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Getting the most from this tab

Optimization cannot fix a 3000px image shown in a 600px slot. It will be smaller, but it is still the wrong image. Upload at a sensible size.
Open PageSpeed Insights or your browser’s performance panel and find out. Optimizing everything else while the real LCP element is untouched is how people conclude a plugin did nothing.
Cached pages built before WebP conversion still reference the originals.
Open your site, look at the network panel, and confirm the image responses are WebP. A CDN in front of your site can strip or override the swap.