Memory:
Memory:
Photoshop will use a percentage of available memory on its startup. It will have to consume scratch disk sooner if started after all the other programs. On the other hand, if it is started first, it will take the first percentage leaving less for other apps. If started first, and is set to 90%, then only 10% remains for the other programs which will then run virtual/poorly using disk space.
To adjust:
Photoshop (top menu) --> Preferences (top menu) --> Performance (left tab)
Scratch Disks:
Scratch Disks:
Photoshop can use one or more local attached disks. For best performance, scratch disks should be on a internal permanently connected drive. That is, they should not be accessed over a network, and should not be removable external hard drives.
Your primary scratch disk should be your fastest hard disk; make sure it has plenty of space available.
To assign scratch disks in Photoshop:
Photoshop (top menu) --> Preferences (top menu) --> Performance (left tab) - or - Scratch Disks (depending on version)
- Select the Macintosh HD (main drive)
- With each drive selected, increase or decrease its usage priority using the arrows, make your fasted drive #1 priority, and make sure the Enabled check-box is selected.
- Click OK (button) to save, restart Photoshop
Notes:
- If you have other connected disks using Thunderbolt 3 or 4 and you leave them connected all the time, you can choose one of them, as well.
To assign scratch disks in Illustrator:
Illustrator (top menu) --> Preferences (top menu) --> Plug-ins & Scratch Disks (left tab)
- Set the Primary Scratch Disk: Macintosh HD (main drive)
- Set the Secondary to None, if no other internal drives, otherwise select the second.
- Click OK (button) to save, restart Illustrator
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