@ricmac I could of course maintain the resolution too (Which I figure you might be wanting) , but I'd still see gains running it this way to either compress a .jpeg or offer up a file format that might be even smaller in file size.
It's pretty nifty
https://www.11ty.dev/docs/plugins/image/
I mean really, I guess I could pre-optimise it still, I just haven't been feeling the need to do that since offloading the task to the plugin.
It'd make for some interesting testing though! I should check one day.