wallet.encrypt takes 4 minutes on React Native

[exakoss]

I am building a mobile ETH wallet with React Native and Expo and got stuck on a very frustrating issue.
First I generate a wallet with ethers.Wallet.createRandom().connect(provider). This works as intended and takes around 6-7 seconds on both React and React Native. However, when I collect a password from a user and run wallet.encrypt() on React Native it takes around 4 minutes to complete, so my app gets stuck on the password confirmation screen and becomes irresponsive. I could proceed to the portfolio screen and let the encryption run in the background, but this seems like a non-desirable workaround compared to the same operation on React, which takes around 5-7 seconds. Is there a particular reason why this method gets so slow on React Native?

My specs:
-React Native: 0.63.2
-Expo: ~40.0.0
-Ethers: ^5.0.32
-@ethersproject/shims: ^5.0.11
-react-native-get-random-values: ^1.6.0

[zemse]

Hey @exakoss,

Can you try the solution mentioned in #612 (comment) ?

You can also see: #1503 (comment)

[exakoss]

Hey @zemse,

I tried the solution that you mentioned but it doesn't seem to help with encryption. Wallet generation might have become 1 second faster but wallet.encrypt still takes around 3.5-4 minutes. Looks like @sosospicy 's solution might have solved the problem, but I have not tried it yet. Lmk if you got anything new on this issue!