By default, WordPress loads some annoying bloat such as JS code for emojis, jQuery Migrate, and other scripts that aren't used by 99% of websites. The new Bloat Eliminator tab in Oxygen lets you disable these.
Improved CSS Caching
All CSS is now cached by Oxygen. The xlink=css URL which caused problems with some weaker hosts and CDNs is gone.
Faster Builder Load Time
Were you sick of waiting 10-15 seconds for Oxygen to open? So were we. We significantly optimized the loading of the builder, and in our tests, the builder interface now opens up in as little as 6 seconds on WP Engine.
Google Fonts Weight Chooser
Using the new weight chooser you can ensure only the font faces you check boxes for will be loaded, preventing the needless loading of bold and italic font faces your site should or may not be using.
Images from the Media Library now automatically generate an HTML srcset attribute, which can enhance performance of images on smaller devices by ensuring they don't download a wider high-resolution image if they don't need to.