CSS !important Overrides Flashing when not using BrowserSync

Hi,

OK. I’m running on MAMP, and when I preview the site using BrowserSync on port 3000, everything displays fine.

When I preview the site on MAMP’s default port 8888 (i.e. how it will be deployed without any BrowserSync magic), it seems that any !important CSS overrides are being applied half a second after the page loads.

Does anyone have any experience of this behaviour and know of potential fixes?

Thanks,
Andy.