Try to decode multiple packets at once

proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/MinecraftVarintFrameDecoder.java

@@ -11,10 +11,7 @@ public class MinecraftVarintFrameDecoder extends ByteToMessageDecoder {
 
   @Override
   protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
-    if (!in.isReadable()) {
-      return;
-    }
-
+    read_lens: while (in.isReadable()) {
       int origReaderIndex = in.readerIndex();
       for (int i = 0; i < 3; i++) {
         if (!in.isReadable()) {
@@ -30,14 +27,15 @@ public class MinecraftVarintFrameDecoder extends ByteToMessageDecoder {
 
           if (in.readableBytes() >= packetLength) {
             out.add(in.readRetainedSlice(packetLength));
+            continue read_lens;
           } else {
             in.readerIndex(origReaderIndex);
-        }
-
             return;
           }
         }
+      }
 
       throw new CorruptedFrameException("VarInt too big");
     }
   }
+}