Added networking optimization, to avoid wasted processing on every read.

Thanks to @catbref for finding this.

src/main/java/org/qortal/network/Peer.java

@@ -473,6 +473,7 @@ public class Peer {
                     return;
                 }
 
+                if (LOGGER.isTraceEnabled()) {
                     if (bytesRead > 0) {
                         byte[] leadingBytes = new byte[Math.min(bytesRead, 8)];
                         this.byteBuffer.asReadOnlyBuffer().position(priorPosition).get(leadingBytes);
@@ -484,6 +485,7 @@ public class Peer {
                         LOGGER.trace("[{}] Received {} bytes into byteBuffer[{}] from peer {}", this.peerConnectionId,
                                 bytesRead, priorPosition, this);
                     }
+                }
                 final boolean wasByteBufferFull = !this.byteBuffer.hasRemaining();
 
                 while (true) {