Todd Weise: Use the proper file type for the subject that offers the best quality and smallest file size. WebP with fallbacks offers best filesize where an SVG won’t work.
Todd Weise: You’ve got to find the proper balance of speed and quality. which means you’ve gotta be careful if you are having older creative directors who are used to working with print and find virtually any level of compression unacceptable.
Todd Weise: Also note. Different tools are able to optimize different file types better than others.
Michael Martinez: Forget SEO. Improve the user experience. If you can save download and rendering time then do it.
Doc Sheldon: It’s not an SEO issue - but jpgs are smaller file size, so storage and bandwidth will be less and they’ll load quicker
Michael Stricker: Doc Sheldon later-generation JPEGs - though Todd’s right about WebP, so if you’re ECommerce it’s worth the extra script and prep.
Doc Sheldon: Something else to be aware of... gzip is the right choice for some files, but it tends to make image files larger, rather than smaller.
Stockbridge Truslow: If you folks are using Wordpress and want to get the speed from WebP - look for a plugin called WebP Express. It`ll create the proper fallback code so that older browsers will use the original images, but serve up scaled WebP images for browsers that can handle them. WebP files are almost always at least 50% smaller than their JPG or PNG counterparts and I commonly see crunch sizes on larger updates at around 70% or so.
Be aware of the settings (things need to happen a bit differently if you have a CDN) and which type of rewrites you want to use. Once it`s set up though... you`ll KNOW you`ve got it working.
Frank Geric: File type shouldn’t make a big difference, especially if you use image compression. What will help is using keywords in the names of your file and in the alt tags.