network: it is 42

32 is a very good number, but we all know 42 is a better one. And it can even
be proven by tests with higher peaking TPS values.

You may wonder why is it so good? Because we're using packet-switching
networks mostly and a packet is a packet almost irrespectively of how bit it
is. Yet a packet has some maximum possible size (hi, MTU) and this size most
of the time is 1500 (or a little less than that, hi VPN). Subtract IP header
(20 for IPv4 or 40 for IPv6 not counting options), TCP header (another 20) and
Neo message/payload headers (~8 for this case) and we have just a little more
than 1400 bytes for our dear hashes. Which means that in a single packet most
of the time we can have 42-44 of them, maybe 45. Choosing between these
numbers is not hard then.

pkg/network/server.go

@@ -1580,7 +1580,7 @@ func (s *Server) initStaleMemPools() {
 func (s *Server) broadcastTxLoop() {
 	const (
 		batchTime = time.Millisecond * 50
-		batchSize = 32
+		batchSize = 42
 	)
 
 	txs := make([]util.Uint256, 0, batchSize)