these are the image sizes that are generated:
'_265', '_512', '_768', '_1024', '_1280', '_1920', '_2560', '_3200', '_3840', '_4096'
these are the pixel widths
so 768px and so on
using the image srcset, only the correct size is loaded into the browser, based on the width of the image in the current browser and device
this is more performant than just loading the original image
so just because your uploads folder is very large it doesnt mean your website is slow when you visit it
you can disable all plugins, lay theme works without any extra plugins
but if you want to use any addons → laytheme.com click "addons" you need to keep them activated
you can send me your website url and such so i can take a look myself:
can you send your website address, /wp-admin/ username and password and a link to this topic to email@example.com?