www.wysiwygwebbuilder.com

Can someone help me with this? I need to create a long page, but it is too heavy for the software to handle. Therefore, I would like to split it into several smaller pages that together form a single one—for example, pages 1, 2, 3, and 4 acting as a single unit (Page 1). Is there a way to achieve this with this program?

There is no option to merge multiple pages into one.
But if it's too heavy then maybe it helps to reduce the size of the images?

As already mentioned there is no merge option. With that said you can embed each page inside an iframe and stack them vertically. Downside to this is scrollbars and the need to adjust the height(s) of each page depending on it contents.