diff --git a/rules/S1643/java/rule.adoc b/rules/S1643/java/rule.adoc
index 8deafcba613..47cf7847214 100644
--- a/rules/S1643/java/rule.adoc
+++ b/rules/S1643/java/rule.adoc
@@ -26,6 +26,50 @@ StringBuilder bld = new StringBuilder();
 ----
 
 
+[options="header"]
+|===
+| Method| size| Runtime| Average time| Error margin
+| plus| 100| Temurin 21| 4.19 µs/op| ±0.34 µs/op
+| plus| 1000| Temurin 21| 377.08 µs/op| ±17.36 µs/op
+| plus| 10000| Temurin 21| 40221.49 µs/op| ±1342.76 µs/op
+| plus| 100000| Temurin 21| 5286840.53 µs/op| ±185796.75 µs/op
+| stringBuilder| 100| Temurin 21| 0.97 µs/op| ±0.03 µs/op
+| stringBuilder| 1000| Temurin 21| 10.25 µs/op| ±1.64 µs/op
+| stringBuilder| 10000| Temurin 21| 93.27 µs/op| ±16.05 µs/op
+| stringBuilder| 100000| Temurin 21| 1019.91 µs/op| ±69.58 µs/op
+|===
+
+
+*Benchmarking code*
+
+The results were generated by running the following snippet with https://github.com/openjdk/jmh[JMH].
+
+[source,java]
+----
+@Param({"100", "1000", "10000", "100000"})
+int size;
+private String word = "append";
+
+@Benchmark
+public String plus() {
+  String str = "";
+  for (int i = 0; i < size; i++) {
+    str = str + word;
+  }
+  return str;
+}
+
+@Benchmark
+public String stringBuilder() {
+  StringBuilder builder = new StringBuilder();
+  for (int i = 0; i < size; i++) {
+    builder.append(word);
+  }
+  return builder.toString();
+}
+----
+
+
 ifdef::env-github,rspecator-view[]
 
 '''