ioserg

Hi johs,
 
Just go to the Export Persona, change to the 'Layers' panel and select all the layers in there and click 'Create Slice' and then go to the 'Slices' panel. Notice that you have now create an exportable slice for each layer. You can select each one and choose its export format and properties. Now you can either select 'Export all' or just click each one to export it individually :)
 
Hopefully that's what you're after? :)
Matt

So, I've done some initial testing with us moving over to ZStandard.  First impressions are good - a modest improvement in compression ratio, and a considerable improvement in compression/decompression speed.  So - after some more testing looks like we might be going for it.
 
I'm also testing a few ideas to help us further improve on compression ratio.  Initial tests have gained between 2% and 8% for my sample 16-bit documents.  8-bit documents remain unchanged - think I've already squeezed all I can there with our immediate compression methods.  I'm next going to explore possibilities for some proprietary methods to see if we can gain any more.

If your source images are JPEGs, then yes - they are heavily compressed, but we (as does Photoshop) will save them with lossless compression which will result in them being much larger.
 
As I demonstrated - we do a better job than PSD when saving out an identical document - so this expansion in file size is totally as expected.
 

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@ioserg

You will find that Affinity files are big, sometimes very big and sometimes inexplicably big for what they contain
Various reasons have been given for this from the Devs (and what you can try to reduce the file size) which you can find in this forum but the bottom line is that compared to what you may have used before Affinity does/can create substantially bigger project files.
So budget on using more space for your files and increased backup times as your usage of Affinity increases.
But don't rush out and purchase additional external drives or cloud storage to directly work from, as Affinity does not play totally nice with them at the moment either.

I imported the jpeg into Photoshop and Affinity -
Without edits, PSD is 23.8MB, and Affinity file is 2.9MB.  Once you edit a layer, then it will be converted to a Pixel layer, which is uncompressed.
 
I see you afphoto file has a number of pixel layers.  That will account for most of the file size.  These layers are also full Pixel layers, and so will be large. This is to be expected.  Your file also has a snapshot, deleting that and re-saving brings your file down from 81.2MB to 54.4MB.
 
I also took your afphoto file, exported it as PSD, then resaved it through Photoshop.  Our PSD is 58MB, Photoshops PSD is 62MB.
 
So - it looks like our handling of your document is more efficient than Photoshop in every case.
 
There is no way that Photoshop would save a 6.5 megapixel image in 5MB.  Are you sure you got your numbers right??