If you share the site URL we can have a look and tell you what images you need to change. Alternatively, there are various tools that can help: Https://webspeedtest.cloudinary.com - image analysis tool that will actually give you optimized images (be aware that Google Sites only accepts JPEGs, PNGs and GIFs) Https://squoosh.app/ - image compressor if you want to manually do it and go with a higher level of... Source: over 2 years ago

I like dithered images and appreciate the author's post. If you don't, but you want your webpages to load fast, look into WebP and AVIF images. Load them opportunistically using the html5 PICTURE tag - no JS required and no worry about old browsers not supporting new formats. Even plain lossless encoding of legacy formats goes a long way. Test your own site for ideas: https://webspeedtest.cloudinary.com. - Source: Hacker News / over 2 years ago

There is also JPEG View which is really fast and simple image viewer for windows https://github.com/sylikc/jpegview) It is very fast, specially noticeable on very large images. - Source: Hacker News / 3 months ago

JPEGView - lightweight image viewer for Windows. ShareX - screen capture tool with other nice features. Source: about 2 years ago

JPEGView should be close enough to what you want. It's very light-weight. Source: about 2 years ago

JPEGView is great, lightweight and opens stuff fast https://sourceforge.net/projects/jpegview/. Source: about 2 years ago

JPEGView - Lean and fast image viewer with minimal GUI. Source: about 2 years ago