Keypair functions taking too much time

[amany9000]

I am running polkadot.js over IOS using react-native. keypair.toJson and keypair.unlock each take almost 60 seconds. Same code I run in a browser extension and it works fine.

The numbers while creating the keyPair:
• cryptoWaitReady 67.58516716957092 milliseconds.
• naclDecrypt 2.701167106628418 milliseconds.
• new Keyring 0.1640000343322754 milliseconds.
• keyring.addFromUri 2326.9085409641266 milliseconds.
• keyPair.toJson 53572.15112495422 milliseconds.

While trying to signAndSend():
• cryptoWaitReady 0.061165809631347656 milliseconds.
• new Keyring 0.009291887283325195 milliseconds.
• keyring.addFromJson 3.1981661319732666 milliseconds.
• keypair.unlock 56587.29391694069 milliseconds.

[amany9000]

@jacogr

[jacogr]

RN is a best-effort.

To make it work we have to compile the normal JS WASM functions to ASM.js (everything else uses WASM - so this is the happy path), which is not optimal at all. We also cannot use pure JS for those functions (where available, e.g. non-sr25519) since BigInt support is spotty at best and the used underlying libs only use bn.

Any PRs to optimize the RN paths would certainly be appreciated.

(This is not a platform I can actually look at myself, I have never worked in that environment and previous efforts to even get a test app running has been fruitless, so it really is as stated - "best effort, assuming it works", hence "any PRs" above.)