diff --git a/core/src/test/java/eu/mulk/quarkus/googlecloud/jsonlogging/FormatterBenchmark.java b/core/src/test/java/eu/mulk/quarkus/googlecloud/jsonlogging/FormatterBenchmark.java
index 1a1c17c..4900a01 100644
--- a/core/src/test/java/eu/mulk/quarkus/googlecloud/jsonlogging/FormatterBenchmark.java
+++ b/core/src/test/java/eu/mulk/quarkus/googlecloud/jsonlogging/FormatterBenchmark.java
@@ -13,12 +13,14 @@
 
   private ExtLogRecord simpleLogRecord;
   private ExtLogRecord structuredLogRecord;
+  private ExtLogRecord massivelyStructuredLogRecord;
   private Formatter formatter;
 
   @Setup
   public void setup() {
     simpleLogRecord = FormatterTest.makeSimpleRecord();
     structuredLogRecord = FormatterTest.makeStructuredRecord();
+    massivelyStructuredLogRecord = FormatterTest.makeMassivelyStructuredRecord();
     formatter = new Formatter(List.of(), List.of());
   }
 
@@ -31,4 +33,10 @@
   public void structuredLogRecord(Blackhole blackhole) {
     blackhole.consume(formatter.format(structuredLogRecord));
   }
+
+  @Benchmark
+  public void massivelyStructuredLogRecord(Blackhole blackhole) {
+    var f = formatter.format(massivelyStructuredLogRecord);
+    blackhole.consume(f);
+  }
 }
diff --git a/core/src/test/java/eu/mulk/quarkus/googlecloud/jsonlogging/FormatterTest.java b/core/src/test/java/eu/mulk/quarkus/googlecloud/jsonlogging/FormatterTest.java
index 91cc8e4..b755230 100644
--- a/core/src/test/java/eu/mulk/quarkus/googlecloud/jsonlogging/FormatterTest.java
+++ b/core/src/test/java/eu/mulk/quarkus/googlecloud/jsonlogging/FormatterTest.java
@@ -93,4 +93,57 @@
         });
     return logRecord;
   }
+
+  @Test
+  void massivelyStructuredRecord() {
+    var logRecord = makeMassivelyStructuredRecord();
+
+    var formatter = new Formatter(List.of(), List.of());
+    var formattingResult = formatter.format(logRecord);
+    assertLinesMatch(
+        List.of(
+            "\\{"
+                + "\"message\":\"Hello, world!\","
+                + "\"severity\":\"INFO\","
+                + "\"timestamp\":\\{\"seconds\":\\d+,\"nanos\":\\d+\\},"
+                + "\"logging.googleapis.com/sourceLocation\":"
+                + "\\{\"file\":\"ReflectionUtils.java\","
+                + "\"line\":\"\\d+\","
+                + "\"function\":\"org.junit.platform.commons.util.ReflectionUtils.invokeMethod\""
+                + "\\},"
+                + "\"int-0\":0,\"int-1\":1,\"int-2\":2,\"int-3\":3,\"int-4\":4,\"int-5\":5,\"int-6\":6,\"int-7\":7,\"int-8\":8,\"int-9\":9,"
+                + "\"double-10\":10.0,\"double-11\":11.0,\"double-12\":12.0,\"double-13\":13.0,\"double-14\":14.0,"
+                + "\"double-15\":15.0,\"double-16\":16.0,\"double-17\":17.0,\"double-18\":18.0,\"double-19\":19.0,"
+                + "\"boolean-20\":true,\"boolean-21\":false,\"boolean-22\":true,\"boolean-23\":false,\"boolean-24\":true,"
+                + "\"boolean-25\":false,\"boolean-26\":true,\"boolean-27\":false,\"boolean-28\":true,\"boolean-29\":false,"
+                + "\"string-30\":\"30\",\"string-31\":\"31\",\"string-32\":\"32\",\"string-33\":\"33\",\"string-34\":\"34\","
+                + "\"string-35\":\"35\",\"string-36\":\"36\",\"string-37\":\"37\",\"string-38\":\"38\",\"string-39\":\"39\""
+                + "\\}\n"),
+        List.of(formattingResult));
+  }
+
+  static ExtLogRecord makeMassivelyStructuredRecord() {
+    var logRecord = FormatterTest.makeSimpleRecord();
+    logRecord.setParameters(
+        new Object[] {
+          (StructuredParameter)
+              () -> {
+                var b = Json.createObjectBuilder();
+                for (int i = 0; i < 10; i++) {
+                  b.add("int-" + i, i);
+                }
+                for (int i = 10; i < 20; i++) {
+                  b.add("double-" + i, (double) i);
+                }
+                for (int i = 20; i < 30; i++) {
+                  b.add("boolean-" + i, i % 2 == 0);
+                }
+                for (int i = 30; i < 40; i++) {
+                  b.add("string-" + i, String.valueOf(i));
+                }
+                return b;
+              }
+        });
+    return logRecord;
+  }
 }