Optimizing images yourself is time consuming, let ImgBot do all the heavy lifting for you. You just sit back and review the PRs :)
Every bit counts while your project is loading and your users are waiting.
Once installed, ImgBot will crawl through all of your image files in GitHub and losslessly compress them. This will make the file size go down, but leave the dimensions and quality untouched. Once it's done, ImgBot will open a pull request for you to review and merge.