When you upload files to workspace those are stored to APEX schema table blob column.
I think one benefit is that if you do e.g. full DB backup those are included.
But if you are not using EPG as web server, you gain performance if you store static files to web server folder e.g. under alias /i/
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Whats the difference between referencing files with workspace_images vs /i/ folder? What is faster/better?
Referencing / hosting in /i/ folder is faster.
I you upload to #WORKSPACE_IMAGES# it takes a procedure call to the DB to get the content into the HTML DOM. If in /i/ it is simply downloaded as a file into HTML DOM and frequently called files are cached.