I'm working on a responsive template that calls different size images. If the path to the images in the "grid" ex. 6 product grid below a hero linked to the image that the query will pull in is 1200 x 1200 will it slow the load time down? Those are the images linked to the website and making them all for each email at a smaller size is just not possible. Will the email be slowed down even if it's not loading the full 1200 x 1200 image in the email?

Does your tool have a weight calculator, that determines the size of each email? Including images? If not do you know how I can look this information up?