diff --git a/timetracker.c b/timetracker.c
index 4d225e3..5c4938d 100644
--- a/timetracker.c
+++ b/timetracker.c
@@ -288,11 +288,30 @@ void save_activities(FILE *f, char *file_path, U32 current_activity, activity *a
     }
 }
 
-#define ACTIVE_FPS 60
-#define IDLE_FPS 1
-#define IDLE_TIME 5 /* seconds */
+global B32 dirty = true;
 
-int main(int argc, char *argv[])
+internal void mark_dirty()
+{
+    dirty = true;
+}
+
+internal void clear_dirty()
+{
+    dirty = false;
+}
+
+internal B32 is_dirty(void)
+{
+    return dirty;
+}
+
+internal void poll_input()
+{
+    if(GetMouseDelta().x != 0 || GetMouseDelta().y != 0 || IsMouseButtonPressed(MOUSE_BUTTON_LEFT) || IsMouseButtonReleased(MOUSE_BUTTON_LEFT) || IsMouseButtonPressed(MOUSE_BUTTON_RIGHT) || GetKeyPressed() != 0 || IsWindowResized())
+        mark_dirty();
+}
+
+S32 main(int argc, char *argv[])
 {
     // TODO: Move into global state.
     activity activities[256]; // TODO: This should be a dynamic array.
@@ -323,8 +342,6 @@ int main(int argc, char *argv[])
     InitWindow(state.window_w, state.window_h, "Time Tracker");
     SetWindowState(FLAG_MSAA_4X_HINT|FLAG_WINDOW_RESIZABLE);
 
-    SetTargetFPS(ACTIVE_FPS);
-
     state.font = LoadFontFromMemory(".ttf", opensans_ttf, opensans_ttf_len, 96, NULL, 0);
     if(!IsFontValid(state.font)) {
         fprintf(stderr, "Unable to load font\n");
@@ -343,17 +360,10 @@ int main(int argc, char *argv[])
     double last_input_s = now();
 
     while(!WindowShouldClose()) {
+        poll_input();
+
         U64 now_s = now();
 
-        if(GetMouseDelta().x != 0 || GetMouseDelta().y != 0 || GetMouseWheelMove() != 0 || GetKeyPressed() != 0 || IsMouseButtonPressed(MOUSE_LEFT_BUTTON) || IsMouseButtonPressed(MOUSE_RIGHT_BUTTON)) {
-            last_input_s = now_s;
-            SetTargetFPS(ACTIVE_FPS);
-        }
-
-        if(now_s - last_input_s > IDLE_TIME) {
-            SetTargetFPS(IDLE_FPS);
-        }
-
         if(now_s >= upper_bound_s) {
             t = today();
             ts = start_of_day_seconds(t);
@@ -474,6 +484,9 @@ int main(int argc, char *argv[])
                     DrawTextEx(state.font, buffer, (Vector2){ start_x + 5.0f, 40.0f + (F32)(activity_type_d.y) }, state.font_size - 10.0f, 2, WHITE);
                 }
             }
+
+            DrawFPS(20, 20);
+
         EndDrawing();
 
         // Reset statistics as we will accumulate seconds again.
@@ -486,6 +499,13 @@ int main(int argc, char *argv[])
             save_activities(f, file_path, current_activity, activities);
             last_save = now_s;
         }
+
+        if(is_dirty()) {
+            clear_dirty();
+            SetTargetFPS(120); // FPS cap
+        } else {
+            SetTargetFPS(20);
+        }
     }
 
     save_activities(f, file_path, current_activity, activities);