What are the drawbacks of moving an app to SD card?

Question

Since I upgraded to Android 2.2, I noted some minor disadvantages of moving an app to SD card, like having to wait the SD card to be mounted after a reboot to be able launch the app.

What other disadvantages are there?

Answer 1

taken straight from android developer site

• There is no effect on the application performance so long as the external storage is mounted on the device.
  • The .apk file is saved on the external storage, but all private user data, databases, optimized .dex files, and extracted native code are saved on the internal device memory.
  • The unique container in which your application is stored is encrypted with a randomly generated key that can be decrypted only by the device that originally installed it. Thus, an application installed on an SD card works for only one device.
  • The user can move your application to the internal storage through the system settings.

Also -> Applications That Should NOT Install on External Storage (more details on android developer site)

• Services
• Alarm Services
• Live Wallpapers
• Live Folders
• App Widgets
• Account Managers
• Sync Adapters
• Device Administrators
• Broadcast Receivers listening for "boot completed"

Answer 2

Widgets won't work if they're on the SD card.

Answer 3

Applications installed on SD card cannot run if you remove your SD card or you're turning on USB Mass storage (so it can be accessed from a computer). That's the only drawback I have been experiencing.

I've actually seen performance improvement since moving to SD; before I moved to SD I had exhausted the internal memory (about a few kilobytes left) and the phone lags quite badly. Since moving to SD (and therefore freeing some space in the internal memory), and the lag disappears.