Bubble uses Imgix to process and deliver images, which includes compression. In rare cases, the compression preset used produces a larger file than the original — particularly with certain PNG images where the compression doesn't result in a size reduction.
What you might notice
An image delivered through Bubble's CDN is larger than the original file you uploaded
Page load times are unexpectedly slow for a specific image
Workaround
You can bypass Imgix for a specific image by appending &ignore_imgix to the end of the image's source URL. Keep in mind that disabling Imgix also removes the benefits of edge network caching, which generally improves delivery speed. In most cases the size difference is small enough that keeping Imgix enabled is the better overall choice.