Fix incorrect handling of 0 values

osu.Framework/Graphics/Performance/FrameTimeDisplay.cs

···
             elapsedSinceLastUpdate = 0;
 
             counter.Text = $"{displayFps:0}fps ({rollingElapsed:0.00}ms)"
-                           + (clock.Throttling ? $"{(clock.MaximumUpdateHz < 10000 ? clock.MaximumUpdateHz.ToString("0") : "∞").PadLeft(4)}hz" : string.Empty);
+                           + (clock.Throttling ? $"{(clock.MaximumUpdateHz > 0 && clock.MaximumUpdateHz < 10000 ? clock.MaximumUpdateHz.ToString("0") : "∞").PadLeft(4)}hz" : string.Empty);
         }
 
         private class CounterText : SpriteText

osu.Framework/Statistics/PerformanceMonitor.cs

···
 
         private Thread thread;
 
-        public double FrameAimTime => 1000.0 / (Clock?.MaximumUpdateHz ?? double.MaxValue);
+        public double FrameAimTime => 1000.0 / (Clock?.MaximumUpdateHz > 0 ? Clock.MaximumUpdateHz : double.MaxValue);
 
         internal PerformanceMonitor(GameThread thread, IEnumerable<StatisticsCounterType> counters)
         {

osu.Framework/Timing/ThrottledFrameClock.cs

···
 
             if (Throttling)
             {
-                if (MaximumUpdateHz > 0)
+                if (MaximumUpdateHz > 0 && MaximumUpdateHz < double.MaxValue)
                 {
                     throttle();
                 }