solana-with-rpc-optimizations/sdk/src/quic.rs

pub const QUIC_PORT_OFFSET: u16 = 6;
// Empirically found max number of concurrent streams
// that seems to maximize TPS on GCE (higher values don't seem to
// give significant improvement or seem to impact stability)
pub const QUIC_MAX_CONCURRENT_STREAMS: usize = 2048;