Define "acceptable".
You could delete some photos.
You could pre-process those photos and reduce their size before adding them.
You could leave the photos in the file system and never add them - maybe just add their file path so you can programmatically pull them in as-needed.
You could zip or 7-zip the file to reduce the size.
You could split the file up into several smaller files.
Does any of the above get you to "acceptable"?