Firstly I'm using photoshop cc2017. But this problem has been around since older versions.
I noticed recently after editing PSD files for a few rounds, most PSD files (even JPG) will end up with a long string of rubbish text in the Raw Data (menu-->file-->file info--> raw data).
Lucky I found a script that can remove the rubbish data manually, from the help of someone in the adobe forum.
The difference it creates are as follows:
• PSD file A with extra rubbish Raw data - greyscale simple icon one layer (file size 30mb)
• PSD file B clean simple Raw data - greyscale simple icon one layer (file size 938kb)
When creating my flyer in illustrator cc, linking a few of these PSDs (with rubbish data) will cause my illustrator file to perform very slowly. Both when opening and saving the file. Biggest difference I notice is the file size of the .ai file (54mb vs 2.4mb).
-----------The data looks like like this-------------------------------------------------------------------
......from..........
4
U.S. Web Coated (SWOP) v2
0
0002B0E39668FE325CA514C4B5BE725D
0004EAB42FF2EEBC5DB3FCB6B879B558
0004F219969ECF9B707A9B90C0D00CD1
000503AB9D77155EAF337051A4214838
0007708141F4E44E488B80A6F396F6A5
00086B80CBD8B8C106F6BFF0CC7C125D
000A2BDB1E049F08EBF5A59D24BEC1DB
000AB192EC844703B32FE95585910613
000B84DD32F5ABCC8D7B5E8681465EE9
000DCD30A725496D72D601F1D95E657E
001023E459B54265290F3416621E5CD5
0010B12B20342C40462B8962CCEEF322
00133814BE393E9CA5CF2A39DAB70A32
0013FA92942B6EC5451A4D9D4972AD7E
001459B85B6353EFA511ACA5CFFF27A4
0014615BD66CD030E9FBA71C2FC943A4
00153566E7DCBFCEE3A5DE7187511B6B
0015FEAF1C4D271B1294DC1B44DBE7D0
0017ED7FA617555EF7D04797B72E2946
0018177A7378EC07FBEBFBD785611819
001C46CB5FC15A737F21AE2DA3AB5B67
001E063C1EE78CB821FB21C88080762A
00227924975065BD5779655BC240DEEE
.....on and on and on.......
---------------I only copy a short part of it, it goes on forever--------------------------
Adobe please fix this. Thank you.