Image compression - hero images vs standard images
Your website will automatically compress any images you upload to 1024 pixels wide / high. This prevents large file sizes slowing your website down.
If you are uploading a hero image which needs to be full width on the website, upload the image directly to the media library and it will be compressed to 2048px wide, yet still look good in your hero sections.
You can then select the image from the page builder, choosing it from your media library.