Yes, Alby can consider using nostr.ts to just do the decryption part instead of nostr-tools.

Or I have to release Blowater as a NIP-07 extension because most users don't want to sign in Blowater with nsec.

Same goes to nostr:nprofile1qqsrx4k7vxeev3unrn5ty9qt9w4cxlsgzrqw752mh6fduqjgqs9chhgpr9mhxue69uhhyetvv9ujuumwdae8gtnnda3kjctv9uqsuamnwvaz7tmwdaejumr0dshsz9mhwden5te0wfjkccte9ehx7um5wghxyctwvshsd5c0fz 

 What’s the link to the repo? 

 https://github.com/BlowaterNostr/nostr.ts 

 https://www.npmjs.com/package/nostr.ts I have a NPM version 

 Spring's decryption is in native code, I didn't measure the performance but from your description of the issue I'd say it's probably js-specific problem. 

 That’s good to know. Is there a way for client devs to debug inside Spring? 

 Not really, unfortunately. You'd have to use mobile Chrome and connect it to desktop dev console to debug properly. Spring only shows logs on the About page, and even those aren't convenient at all.