diff --git a/CMakeLists.txt b/CMakeLists.txt
index 568d868..51ed7f5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -81,14 +81,14 @@ set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 if(AARE_FETCH_LMFIT)
     #TODO! Should we fetch lmfit from the web or inlcude a tar.gz in the repo?
-    set(lmfit_patch git apply ${CMAKE_CURRENT_SOURCE_DIR}/patches/lmfit.patch)
+    #set(lmfit_patch git apply ${CMAKE_CURRENT_SOURCE_DIR}/patches/lmfit.patch)
     FetchContent_Declare(
         lmfit
         GIT_REPOSITORY https://jugit.fz-juelich.de/mlz/lmfit.git
         GIT_TAG        main
-        PATCH_COMMAND ${lmfit_patch}
-        UPDATE_DISCONNECTED 1
-        EXCLUDE_FROM_ALL 1
+        #PATCH_COMMAND ${lmfit_patch}
+        #UPDATE_DISCONNECTED 1
+        #EXCLUDE_FROM_ALL 1
     )
     #Disable what we don't need from lmfit
     set(BUILD_TESTING OFF CACHE BOOL "")
@@ -359,7 +359,7 @@ set(SourceFiles
 add_library(aare_core STATIC ${SourceFiles})
 target_include_directories(aare_core PUBLIC 
     "$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>" 
-    "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>"
+    "$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>" PRIVATE ${lmfit_SOURCE_DIR}/lib
 )
 
 
diff --git a/benchmarks/CMakeLists.txt b/benchmarks/CMakeLists.txt
index d083bab..699b4c6 100644
--- a/benchmarks/CMakeLists.txt
+++ b/benchmarks/CMakeLists.txt
@@ -1,11 +1,27 @@
-find_package(benchmark REQUIRED)
 
-add_executable(ndarray_benchmark ndarray_benchmark.cpp)
+include(FetchContent)
 
-target_link_libraries(ndarray_benchmark benchmark::benchmark aare_core aare_compiler_flags)
-# target_link_libraries(tests PRIVATE aare_core aare_compiler_flags)
 
-set_target_properties(ndarray_benchmark PROPERTIES
-        RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}
-        # OUTPUT_NAME run_tests
+FetchContent_Declare(
+    benchmark
+    GIT_REPOSITORY https://github.com/google/benchmark.git
+    GIT_TAG        v1.8.3 # Change to the latest version if needed
+)
+
+# Ensure Google Benchmark is built correctly
+set(BENCHMARK_ENABLE_TESTING OFF CACHE BOOL "" FORCE)
+
+FetchContent_MakeAvailable(benchmark)
+
+add_executable(benchmarks)
+
+target_sources(benchmarks PRIVATE ndarray_benchmark.cpp calculateeta_benchmark.cpp)
+
+# Link Google Benchmark and other necessary libraries
+target_link_libraries(benchmarks PRIVATE benchmark::benchmark aare_core aare_compiler_flags)
+
+# Set output properties
+set_target_properties(benchmarks PROPERTIES
+    RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}
+    OUTPUT_NAME run_benchmarks
 )
\ No newline at end of file
diff --git a/benchmarks/calculateeta_benchmark.cpp b/benchmarks/calculateeta_benchmark.cpp
new file mode 100644
index 0000000..dc7cd91
--- /dev/null
+++ b/benchmarks/calculateeta_benchmark.cpp
@@ -0,0 +1,66 @@
+#include "aare/ClusterFile.hpp"
+#include <benchmark/benchmark.h>
+
+using namespace aare;
+
+class ClusterFixture : public benchmark::Fixture {
+  public:
+    Cluster<int, 2, 2> cluster_2x2{};
+    Cluster<int, 3, 3> cluster_3x3{};
+
+    void SetUp(::benchmark::State &state) {
+        int temp_data[4] = {1, 2, 3, 1};
+        std::copy(std::begin(temp_data), std::end(temp_data),
+                  std::begin(cluster_2x2.data));
+
+        cluster_2x2.x = 0;
+        cluster_2x2.y = 0;
+
+        int temp_data2[9] = {1, 2, 3, 1, 3, 4, 5, 1, 20};
+        std::copy(std::begin(temp_data2), std::end(temp_data2),
+                  std::begin(cluster_3x3.data));
+
+        cluster_3x3.x = 0;
+        cluster_3x3.y = 0;
+    }
+
+    // void TearDown(::benchmark::State& state) {
+    // }
+};
+
+BENCHMARK_F(ClusterFixture, Calculate2x2Eta)(benchmark::State &st) {
+    for (auto _ : st) {
+        // This code gets timed
+        Eta2 eta = calculate_eta2(cluster_2x2);
+        benchmark::DoNotOptimize(eta);
+    }
+}
+
+// almost takes double the time
+BENCHMARK_F(ClusterFixture,
+            CalculateGeneralEtaFor2x2Cluster)(benchmark::State &st) {
+    for (auto _ : st) {
+        // This code gets timed
+        Eta2 eta = calculate_eta2<int, 2, 2>(cluster_2x2);
+        benchmark::DoNotOptimize(eta);
+    }
+}
+
+BENCHMARK_F(ClusterFixture, Calculate3x3Eta)(benchmark::State &st) {
+    for (auto _ : st) {
+        // This code gets timed
+        Eta2 eta = calculate_eta2(cluster_3x3);
+        benchmark::DoNotOptimize(eta);
+    }
+}
+
+// almost takes double the time
+BENCHMARK_F(ClusterFixture,
+            CalculateGeneralEtaFor3x3Cluster)(benchmark::State &st) {
+    for (auto _ : st) {
+        // This code gets timed
+        Eta2 eta = calculate_eta2<int, 3, 3>(cluster_3x3);
+        benchmark::DoNotOptimize(eta);
+    }
+}
+// BENCHMARK_MAIN();
\ No newline at end of file
diff --git a/include/aare/ClusterFile.hpp b/include/aare/ClusterFile.hpp
index 836565b..e9530f6 100644
--- a/include/aare/ClusterFile.hpp
+++ b/include/aare/ClusterFile.hpp
@@ -445,7 +445,7 @@ Eta2 calculate_eta2(
  * @brief Calculate the eta2 values for a 3x3 cluster and return them in a Eta2
  * struct containing etay, etax and the corner of the cluster.
  */
-/*
+
 template <typename T> Eta2 calculate_eta2(const Cluster<T, 3, 3> &cl) {
     Eta2 eta{};
 
@@ -489,9 +489,7 @@ template <typename T> Eta2 calculate_eta2(const Cluster<T, 3, 3> &cl) {
     }
     return eta;
 }
-*/
 
-/*
 template <typename T> Eta2 calculate_eta2(const Cluster<T, 2, 2> &cl) {
     Eta2 eta{};
 
@@ -501,7 +499,6 @@ template <typename T> Eta2 calculate_eta2(const Cluster<T, 2, 2> &cl) {
     eta.c = cBottomLeft; // TODO! This is not correct, but need to put something
     return eta;
 }
-*/
 
 // calculates Eta3 for 3x3 cluster based on code from analyze_cluster
 // TODO only supported for 3x3 Clusters