zetaclient: Improve rate we can emit Solana Devnet outbound transactions
Problem Description
Currently Solana takes about 40 seconds to create each Solana Devnet outbound, and they are produced serially. This makes the existing Solana integration's performance sensitive to load.
Request
Improve throughput so that backlogs of transactions can clear more quickly.
Potentially related: https://github.com/zeta-chain/node/pull/3708 feat(zetaclient): solana lead relayer
Note: prefer to keep it out of milestone if it's already tracked in a parent issue in a milestone for a cleaner tracking system
This issue seems outdated. According to my local stress test, 100 Solana withdrawals were done within 5m13, with an average speed of 3 sec / tx. @lumtis @CryptoFewka Should we just close this?