Modern frameworks optimize images automatically at build time or on-demand.
You don't need WP Smush after migrating to Next.js or Astro. Modern frameworks offer built-in solutions or lightweight npm packages that replace WP Smush with better performance and zero plugin bloat. See the alternatives below.
Official docs: Next.js Documentation · Astro Documentation
Smush alternatives for image optimization
Automatic image optimization
Visit https://nextjs.org/docs/app/building-your-application/optimizing/images
Image CDN and optimization
Visit https://cloudinary.com
Use framework image component
Configure optimization settings
Images optimized automatically
Optional: use image CDN
In-depth guides and tutorials to help with your migration
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