Performance: Snapshots

[bw-solana]

A few ideas in this space:

1. There appears to be an issue when snapshots are disabled, we don’t purge zero lamport accounts. This is a common scenario for RPCs. Startup only sets latest_full_snapshot_slot if generating snapshots #3633 fixed this
2. There’s a thought that we should pause snapshot (and really all background activity in ABS - or maybe even all non-essential work) leading into and during leader slot. This is because there is a bunch of extra work to do leading up to leader slot (priming transactions through the TPU), but it’s also critically important for replay to keep up so we can transition leaders quickly (must complete replay before building off majority fork tip).

[brooksprumo]

Yeah, (1) is fixed and can be removed/marked done.