Improved PlayerInfo packet adapter performance. There may still be lag if ProtocolLib performs exceptionally bad on your server. In that case you could turn off the following features as a workaround until hopefully eventually ProtocolLib's performance increases again:
Turn off MarkVanishedPlayersAsSpectators (You can use MarkVanishedPlayersWithGlow instead)
Turn off OpenChestsSilently (You can switch to spectator mode with double-shift instead)
Set PlayerHider to Prevention (or, alternatively, set it to Hybrid but add PlayerInfo to the DisabledInvisibilityModules)
The PreventHittingEntities restrictive setting now applies to projectiles originating from vanished players, too.