diff --git a/OpenRa.Game/Actor.cs b/OpenRa.Game/Actor.cs
index 176876f6f8..5321298f5b 100644
--- a/OpenRa.Game/Actor.cs
+++ b/OpenRa.Game/Actor.cs
@@ -13,6 +13,6 @@ namespace OpenRa.Game
 		public abstract float2 RenderLocation { get; }
 		public int palette;
 		public abstract Sprite[] CurrentImages { get; }
-		public virtual void Tick(Game game, double t) { }
+		public virtual void Tick(Game game, int t) { }
 	}
 }
diff --git a/OpenRa.Game/Animation.cs b/OpenRa.Game/Animation.cs
index 715fc40853..a2620644c1 100644
--- a/OpenRa.Game/Animation.cs
+++ b/OpenRa.Game/Animation.cs
@@ -59,10 +59,10 @@ namespace OpenRa.Game
 			};
 		}
 
-		double timeUntilNextFrame;
+		int timeUntilNextFrame;
 
-		Action<double> tickFunc;
-		public void Tick( double t )
+		Action<int> tickFunc;
+		public void Tick( int t )
 		{
 			if( tickAlways )
 				tickFunc( t );
@@ -71,8 +71,8 @@ namespace OpenRa.Game
 				timeUntilNextFrame -= t;
 				while( timeUntilNextFrame <= 0 )
 				{
-					tickFunc( 40.0 / 1000.0 );
-					timeUntilNextFrame += ( 40.0 / 1000.0 ); // 25 fps == 40 ms
+					tickFunc( 40 );
+					timeUntilNextFrame += 40; // 25 fps == 40 ms
 				}
 			}
 		}
diff --git a/OpenRa.Game/Building.cs b/OpenRa.Game/Building.cs
index 890afd2499..1ab5fbf1b4 100644
--- a/OpenRa.Game/Building.cs
+++ b/OpenRa.Game/Building.cs
@@ -18,7 +18,7 @@ namespace OpenRa.Game
 			animation.PlayThen( "make", delegate { animation.Play( "idle" ); } );
 		}
 
-		public override void Tick( Game game, double t )
+		public override void Tick( Game game, int t )
 		{
 			animation.Tick( t );
 		}
diff --git a/OpenRa.Game/Game.cs b/OpenRa.Game/Game.cs
index fe54b56969..cdd5477194 100644
--- a/OpenRa.Game/Game.cs
+++ b/OpenRa.Game/Game.cs
@@ -9,7 +9,6 @@ namespace OpenRa.Game
 	{
 		public readonly World world;
 		public readonly Map map;
-		public readonly SpriteRenderer SpriteRenderer;
 		public readonly TreeCache treeCache;
 		public readonly TerrainRenderer terrain;
 		public readonly Viewport viewport;
@@ -18,7 +17,6 @@ namespace OpenRa.Game
 
 		public Game( string mapName, Renderer renderer, int2 clientSize )
 		{
-			SheetBuilder.Initialize( renderer.Device );
 			map = new Map( new IniFile( FileSystem.Open( mapName ) ) );
 			FileSystem.Mount( new Package( "../../../" + map.Theater + ".mix" ) );
 
@@ -35,5 +33,15 @@ namespace OpenRa.Game
 
 			network = new Network();
 		}
+
+		public void Tick()
+		{
+			viewport.DrawRegions( this );
+		}
+
+		public void Issue( IOrder order )
+		{
+			order.Apply();
+		}
 	}
 }
diff --git a/OpenRa.Game/MainWindow.cs b/OpenRa.Game/MainWindow.cs
index dac26706e1..1859bc80aa 100644
--- a/OpenRa.Game/MainWindow.cs
+++ b/OpenRa.Game/MainWindow.cs
@@ -39,6 +39,7 @@ namespace OpenRa.Game
 
 			bool windowed = !settings.GetValue("fullscreeen", false);
 			renderer = new Renderer(this, GetResolution(settings), windowed);
+			SheetBuilder.Initialize( renderer.Device );
 
 			game = new Game( settings.GetValue( "map", "scm12ea.ini" ), renderer, new int2( ClientSize ) );
 
@@ -60,7 +61,7 @@ namespace OpenRa.Game
 		{
 			while (Created && Visible)
 			{
-				game.viewport.DrawRegions( game );
+				game.Tick();
 				Application.DoEvents();
 			}
 		}
@@ -75,7 +76,8 @@ namespace OpenRa.Game
 			if (e.Button == MouseButtons.Left)
 			{
 				float2 xy = ( 1 / 24.0f ) * ( new float2( e.Location ) + game.viewport.Location );
-				game.world.myUnit.Order( new int2( (int)xy.X, (int)xy.Y ) ).Apply();
+				IOrder order = game.world.myUnit.Order( new int2( (int)xy.X, (int)xy.Y ) );
+				game.Issue( order );
 			}
 		}
 
diff --git a/OpenRa.Game/Mcv.cs b/OpenRa.Game/Mcv.cs
index 88d22d8081..02c995b37f 100644
--- a/OpenRa.Game/Mcv.cs
+++ b/OpenRa.Game/Mcv.cs
@@ -16,7 +16,7 @@ namespace OpenRa.Game
 
 		public void AcceptDeployOrder()
 		{
-			nextOrder = delegate( Game game, double t )
+			nextOrder = delegate( Game game, int t )
 			{
 				if( Turn( 12 ) )
 					return;
diff --git a/OpenRa.Game/Unit.cs b/OpenRa.Game/Unit.cs
index 9a000a7314..5789f11435 100644
--- a/OpenRa.Game/Unit.cs
+++ b/OpenRa.Game/Unit.cs
@@ -12,7 +12,7 @@ namespace OpenRa.Game
 		protected int2 fromCell, toCell;
 		protected int moveFraction, moveFractionTotal;
 
-		protected delegate void TickFunc( Game game, double t );
+		protected delegate void TickFunc( Game game, int t );
 		protected TickFunc currentOrder = null;
 		protected TickFunc nextOrder = null;
 
@@ -54,7 +54,7 @@ namespace OpenRa.Game
 
 		const int Speed = 6;
 
-		public override void Tick( Game game, double t )
+		public override void Tick( Game game, int t )
 		{
 			animation.Tick( t );
 			if( currentOrder == null && nextOrder != null )
@@ -69,7 +69,7 @@ namespace OpenRa.Game
 
 		public void AcceptMoveOrder( int2 destination )
 		{
-			nextOrder = delegate( Game game, double t )
+			nextOrder = delegate( Game game, int t )
 			{
 				if( nextOrder != null )
 					destination = toCell;
@@ -77,7 +77,7 @@ namespace OpenRa.Game
 				if( Turn( GetFacing( toCell - fromCell ) ) )
 					return;
 
-				moveFraction += (int)( t * ( Speed * 100 ) );
+				moveFraction += t * Speed;
 				if( moveFraction < moveFractionTotal )
 					return;
 
@@ -97,7 +97,7 @@ namespace OpenRa.Game
 					toCell = res[ res.Count - 1 ];
 
 					int2 dir = toCell - fromCell;
-					moveFractionTotal = ( dir.X != 0 && dir.Y != 0 ) ? 250 : 200;
+					moveFractionTotal = ( dir.X != 0 && dir.Y != 0 ) ? 2500 : 2000;
 				}
 				else
 					destination = toCell;
diff --git a/OpenRa.Game/World.cs b/OpenRa.Game/World.cs
index f71bcfd220..35127926d1 100644
--- a/OpenRa.Game/World.cs
+++ b/OpenRa.Game/World.cs
@@ -27,12 +27,12 @@ namespace OpenRa.Game
 		public void Remove( Actor a ) { actors.Remove( a ); }
 		public void AddFrameEndTask( Action<World> a ) { frameEndActions.Add( a ); }
 
-		double lastTime = Environment.TickCount / 1000.0;
+		int lastTime = Environment.TickCount;
 
 		void Draw( Game game )
 		{
-			double t = Environment.TickCount / 1000.0;
-			double dt = t - lastTime;
+			int t = Environment.TickCount;
+			int dt = t - lastTime;
 			lastTime = t;
 
 			Range<float2> range = new Range<float2>(viewport.Location, viewport.Location + viewport.Size);