My image size is 741KB on my computer and Github, but when I load the website which is hosted on Netlify, image size is 2,194KB. I downloaded the big file and see all width, height, resolutions and bit depth are the same.
I am using Gatsby + NetlifyCMS
On https://gatsby-netlify-cms.netlify.com/ file home-jumbotron.jpg is 437KB
But on github https://github.com/netlify-templates/gatsby-starter-netlify-cms/blob/master/static/img/home-jumbotron.jpg file size is 138KB