Disk operations on Decrypt are slow

Loading and saving the account in each decrypt request is quite slow. You might want to add a cache and just keep the account in memory while the app runs. Also, I am not sure what has changed to require saving after decryption.

Since this method can be called 1000s of times, every inch of performance gain is welcome :)

Amber/app/src/main/java/com/greenart7c3/nostrsigner/SignerProvider.kt

Line 89 in 8e6b952

    
           val account = LocalPreferences.loadFromEncryptedStorage(projection[2]) ?: return null

Amber/app/src/main/java/com/greenart7c3/nostrsigner/SignerProvider.kt

Line 124 in 8e6b952

LocalPreferences.saveToEncryptedStorage(account)

The saving was not needed and I made some changes in the nip46 branch.
I'll try to release a new version next week.
If you want to make some more tests try compiling the nip46 branch to see if it improved the performance