Constant DEFAULT_MAX_SESSIONS 

pub const DEFAULT_MAX_SESSIONS: usize = 64;

Default ceiling on concurrently established WSS sessions. See WssLimits::max_sessions. Sized as an explicit host-memory policy, not a connection-count guess: the parser envelope (rpc_ws_config) is 32 MiB per session, so this default caps the aggregate parser reservation at 2 GiB - defensible on a small daemon host - while 64 concurrent remote sessions is far beyond a personal daemon’s working set. Operators with bigger hosts and fleets raise it consciously, envelope arithmetic in hand.