diff --git a/src/prof.hpp b/src/prof.hpp
new file mode 100644
index 0000000..9a40d38
--- /dev/null
+++ b/src/prof.hpp
@@ -0,0 +1,15 @@
+struct Prof_Scope_Print {
+	Prof_Scope_Print(const char *name) : scope_name { name }, scope_start_t { std::chrono::high_resolution_clock::now() } {}
+	~Prof_Scope_Print() {
+	  using namespace std::chrono;
+		time_point scope_end_t = high_resolution_clock::now();
+		duration scope_duration = duration_cast<microseconds>(scope_end_t - scope_start_t);
+		fprintf(stderr, "[profile] %s took %.4f ms\n", scope_name, scope_duration.count() * 0.001f);
+	}
+
+	const char *scope_name;
+	std::chrono::time_point<std::chrono::high_resolution_clock> scope_start_t;
+};
+
+#define TIMED_SCOPE() const Prof_Scope_Print CONCAT_STR(_prof, __LINE__) { __func__ }
+#define TIMED_SCOPE_NAME(name) const Prof_Scope_Print CONCAT_STR(_prof, __LINE__) { name }
diff --git a/src/rntviewer.cpp b/src/rntviewer.cpp
index fafb385..37aae02 100644
--- a/src/rntviewer.cpp
+++ b/src/rntviewer.cpp
@@ -33,6 +33,7 @@
 
 #include "types.h"
 #include "defer.hpp"
+#include "prof.hpp"
 #include "mem.h"
 #include "str.h"
 #include "rntuple.h"