The latest .key I created is huge, .... Finder shows it as 5GB. Other .key of similar slide total are about 300-500MB. There is nothing different about this one. It is just .jpg files (photos) and text. No movies, no audio. Why so big??

Question

iMac.  2.4GHz.  Core 2 Duo.  2GB SDRAM.  OS - 10.9.5.   Keynote - 6.2.2 v.1878. 
I just completed a keynote slide show.  The Finder indicates it is 5.25GB.  It is 200 slides, no movies, no audio of any kind, no special transitions.  It is just photos and some added text explanations.  The individual photos are each 5-6MB, with about 190 photos total.  I have other previous .key's about the size in terms of the number of photos and they are showing in the Finder as taking up 300-500MB.  There is nothing different with this one particular presentation.  I usually organize and store my photos using .key after a trip.  Photos are downloaded into iPhoto (7.1.5) and then I build a keynote presentation by copying the photos as .jpg's out of iPhoto and into Keynote, with text as notes on or under each photo.  Something changed with the latest keynote in terms of file size.  But I can't determined why it required 5.25GB of disc space while other .key's of the approximate same size and content are only taking 10% of that amount.  Anyone have an idea what is going on with keynote is this particular instance???  I know I could compress it, but I want to understand why the last time I used keynote the file size was so huge.    Thanks for the help. 

Answer 1

Some additional information.  In looking at the package contents info, under the DATA Folder there are several entries for each slide/photo in the .key presentation.  There is a long list of contents that shows each image as:
    pasted-image-1234.png
and a second list right below that identifies each image again in the .key as:
    pasted-image-small-1234.png
Both of these lists show image files of 15-25MB for each photo, even though the original .jpg photo was 4-6MB.  They list/show all of the images in the .key, but DO NOT show the added text.  So it appears the package contents indicates two separate .png files for each photo in the .key, but the file size for each is 3-5 times greater than the original .jpg that was copy/pasted from iPhoto.  And for some reason there are two copies of each. 
There is also a list for the two following image/data files:
    pasted-image-small-small-1234.png
    st12-1234.png
Both of these lists show a file size of 100-200KB for each image, and again show all of the images in the.key.
Only the st-xx-xxxx.png list of images also show the added text. 
Again it appears when I created the Keynote presentation by copy/paste images from iPhoto, Keynote stored multiple copies of each image as .png file several times larger than the original .jpg.   The completed Keynote slide show is so large is almost impossible to work with.  The system is so slow that routine commands are not completed, e.g., trying to "save as" into a .pdf never finishes and I have to "force quit". 
Still trying to determine why this occurred with the 6.2.2 version.  Any chance I can delete all but the st-xx-xxxx image list and get back to a normal file size??