Apps · Choosing which apps to move
What kind of external drive is best for running moved apps?
Short answer: A fast external SSD on USB-C or Thunderbolt, formatted as APFS and usually kept connected. Slower drives work but apps will feel sluggish.
A fast external SSD on a USB-C or Thunderbolt port, formatted as APFS, gives the best experience — moved apps launch and run much as they would from the built-in drive. A slower spinning hard drive or USB stick works, but apps will feel sluggish.
Also choose a drive you keep connected most of the time, since moved apps need it. See external drives.