Merge pull request #6049 from ipfs/fix/yamux-window-size

yamux: increase yamux window size to 8MiB.

core/core.go

@@ -410,7 +410,7 @@ func makeSmuxTransportOption(mplexExp bool) libp2p.Option {
 		ConnectionWriteTimeout: time.Second * 10,
 		KeepAliveInterval:      time.Second * 30,
 		EnableKeepAlive:        true,
-		MaxStreamWindowSize:    uint32(1024 * 512),
+		MaxStreamWindowSize:    uint32(16 * 1024 * 1024), // 16MiB
 		LogOutput:              ioutil.Discard,
 	}