Troubleshoot LND latency issues #37
Description
Anecdotally, payments are very slow compared to the ETH/XRP implementations, even with a direct channel between two LND instances operating on the same machine.
- More formally benchmark this; identify bottlenecks
- How much does the 1.5 roundtrips when clearing HTLCs affect this?
- How much latency is from gRPC/notifications of settled invoices?
- How much does this PR, reducing roundtrips from 1.5 to 0.5 when settling HTLCs, reduce latency?