print warning for large serialized strings

lib/serialization/BinaryMiddleware.js

@@ -177,6 +177,16 @@ class BinaryMiddleware extends SerializerMiddleware {
 					}
 					currentBuffer.write(thing, currentPosition);
 					currentPosition += len;
+					if (len > 102400 && context.logger) {
+						context.logger.warn(
+							`Serializing big strings (${Math.round(
+								len / 1024
+							)}kiB) impacts deserialization performance (consider Buffer instead): ${thing.slice(
+								0,
+								100
+							)}...\n`
+						);
+					}
 					break;
 				}
 				case "number": {