Default_html5 mouseover image size

[sharon]

Could anyone let me know the size of the image used for the mouseover enlarge function ?  I am trying to optimise my images for fast website loading. I realise that in System Settings the size of the product image and thumbnails etc can be set but can't find the size of the enlarged image - is it the original  image size ?
Thanks

[eCommerce Core]

Image sizes are generated automatically based on settings in appearance section. Size of images in listing and product details pages are different. Images will not be full size.

[sharon]

Thank you.
I now understand and have run tests seeing that the product image size is as set in the system settings and the mouseover will move over / display the full sized image.

Thanks for the quick answer.