diff --git a/mods/src/benchmark/benchmark.cpp b/mods/src/benchmark/benchmark.cpp
index 154cbb1f..274fd50b 100644
--- a/mods/src/benchmark/benchmark.cpp
+++ b/mods/src/benchmark/benchmark.cpp
@@ -153,10 +153,21 @@ static void Minecraft_update_injection(Minecraft *minecraft) {
     }
 }
 
+// PerformanceTestChunkSource
+static RandomLevelSource *PerformanceTestChunkSource_constructor(__attribute__((unused)) RandomLevelSource_constructor_t original, __attribute__((unused)) RandomLevelSource *self, Level *level, __attribute__((unused)) int seed, __attribute__((unused)) int version, __attribute__((unused)) bool enable_spawning) {
+    PerformanceTestChunkSource *self2 = (PerformanceTestChunkSource *) self;
+    self2->vtable = PerformanceTestChunkSource_vtable_base;
+    self2->level = level;
+    return self;
+}
+static bool LevelData_getSpawnMobs_injection(__attribute__((unused)) LevelData_getSpawnMobs_t original, __attribute__((unused)) LevelData *level_data) {
+    return false;
+}
+
 // Init Benchmark
 void init_benchmark() {
     // --benchmark: Activate Benchmark
-    bool active = getenv(_MCPI_BENCHMARK_ENV) != nullptr;
+    const bool active = getenv(_MCPI_BENCHMARK_ENV) != nullptr;
     if (active) {
         misc_run_on_update(Minecraft_update_injection);
         // Track Frames
@@ -167,5 +178,8 @@ void init_benchmark() {
         media_set_interactable(0);
         // Disable V-Sync
         media_disable_vsync();
+        // Use PerformanceTestChunkSource
+        overwrite_calls(RandomLevelSource_constructor, PerformanceTestChunkSource_constructor);
+        overwrite_calls(LevelData_getSpawnMobs, LevelData_getSpawnMobs_injection);
     }
 }
diff --git a/symbols/CMakeLists.txt b/symbols/CMakeLists.txt
index 4f5b1f77..246f78bf 100644
--- a/symbols/CMakeLists.txt
+++ b/symbols/CMakeLists.txt
@@ -83,6 +83,7 @@ set(SRC
     src/level/LevelStorageSource.def
     src/level/renderer/ParticleEngine.def
     src/level/RandomLevelSource.def
+    src/level/PerformanceTestChunkSource.def
     src/level/LevelData.def
     src/level/LevelSettings.def
     src/level/ServerLevel.def
diff --git a/symbols/src/level/PerformanceTestChunkSource.def b/symbols/src/level/PerformanceTestChunkSource.def
new file mode 100644
index 00000000..653c411b
--- /dev/null
+++ b/symbols/src/level/PerformanceTestChunkSource.def
@@ -0,0 +1,5 @@
+extends ChunkSource;
+
+vtable 0x110560;
+
+property Level *level = 0x8;
\ No newline at end of file
diff --git a/symbols/src/level/RandomLevelSource.def b/symbols/src/level/RandomLevelSource.def
index 6d41eeae..e4ce25dd 100644
--- a/symbols/src/level/RandomLevelSource.def
+++ b/symbols/src/level/RandomLevelSource.def
@@ -1,5 +1,7 @@
 extends ChunkSource;
 
+constructor (Level *level, int seed, int version, bool enable_spawning) = 0xb4424;
+
 vtable 0x110598;
 
 method void buildSurface(int chunk_x, int chunk_y, uchar *chunk_data, Biome **biomes) = 0xb32ec;