diff --git a/.gitignore b/.gitignore
index 6ea5cb7..177df1e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -33,4 +33,5 @@
 
 .DS_Store
 build/
+.vscode/
 *.nc
\ No newline at end of file
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 87b8878..f702cfd 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -6,7 +6,7 @@ set(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/bin)
 
 add_executable(magtet ${SRC_DIR})
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++11 -O2")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++11 -O3")
 
 find_library(GCTL_LIBRARY gctl /usr/local/lib)
 target_link_libraries(magtet PUBLIC ${GCTL_LIBRARY})