main: run the throbber on a wallclock based timer, so the VU meter updates don't cause crazy spinning

src/main.rs

@@ -642,15 +642,16 @@ async fn main() {
         }
     });
 
-    let mut app = App::new(prediction_request_in);
-    app.load();
-
     let mut events = EventStream::new();
+    let mut last_tick = Instant::now();
 
     loop {
-        terminal.draw(|frame| { app.draw(frame)}).unwrap();
-        app.throbber_state.calc_next();
+        if last_tick.elapsed() >= std::time::Duration::from_millis(100) {
+            last_tick = Instant::now();
+            app.throbber_state.calc_next();
+        }
         app.scene.direction.time_remaining = app.end_time.signed_duration_since(Utc::now());
+        terminal.draw(|frame| { app.draw(frame)}).unwrap();
 
         let delay = Delay::new(std::time::Duration::from_millis(60)).fuse();
         let event = events.next().fuse();