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How to optimize Magento 2 performance for large image-heavy fashion catalog?

I’m handling a project at a Fashion Website Design and Development Company where the client has 5,000+ fashion products with multiple images each. Category pages load slowly (3–6 seconds), especially when layered navigation is used.

We are already using WebP, caching, and image compression. What additional steps, modules, or server configurations help improve performance for a fashion catalog with many high-quality images?