Time each bar in the loading screen and print it to the log, useful information to see where most time is spent in loading.

fml/patches/minecraft/net/minecraft/client/Minecraft.java.patch

@@ -64,7 +64,7 @@
          this.field_110451_am.func_110542_a(this.field_71464_q);
          this.field_110451_am.func_110542_a(new GrassColorReloadListener());
          this.field_110451_am.func_110542_a(new FoliageColorReloadListener());
-+        cpw.mods.fml.common.ProgressManager.ProgressBar bar= cpw.mods.fml.common.ProgressManager.push("Rendering Setup", 9);
++        cpw.mods.fml.common.ProgressManager.ProgressBar bar= cpw.mods.fml.common.ProgressManager.push("Rendering Setup", 9, true);
 +        bar.step("Loading Render Manager");
          RenderManager.field_78727_a.field_78721_f = new ItemRenderer(this);
 +        bar.step("Loading Entity Renderer");

fml/patches/minecraft/net/minecraft/client/resources/SimpleReloadableResourceManager.java.patch

@@ -4,7 +4,7 @@
      public void func_110541_a(List p_110541_1_)
      {
          this.func_110543_a();
-+        cpw.mods.fml.common.ProgressManager.ProgressBar resReload = cpw.mods.fml.common.ProgressManager.push("Loading Resources", p_110541_1_.size()+1);
++        cpw.mods.fml.common.ProgressManager.ProgressBar resReload = cpw.mods.fml.common.ProgressManager.push("Loading Resources", p_110541_1_.size()+1, true);
          field_147967_a.info("Reloading ResourceManager: " + field_130074_a.join(Iterables.transform(p_110541_1_, new Function()
          {
              private static final String __OBFID = "CL_00001092";

fml/src/main/java/cpw/mods/fml/client/SplashProgress.java

@@ -363,7 +363,7 @@ public class SplashProgress
                 drawBox(barWidth - 2, barHeight - 2);
                 // slidy part
                 setColor(barColor);
-                drawBox((barWidth - 2) * b.getStep() / b.getSteps(), barHeight - 2);
+                drawBox((barWidth - 2) * (b.getStep() + 1) / (b.getSteps() + 1), barHeight - 2); // Step can sometimes be 0.
                 // progress text
                 String progress = "" + b.getStep() + "/" + b.getSteps();
                 glTranslatef(((float)barWidth - 2) / 2 - fontRenderer.getStringWidth(progress), 2, 0);
@@ -766,4 +766,4 @@ public class SplashProgress
         }
         return mcPack.getInputStream(loc);
     }
-}
+}

fml/src/main/java/cpw/mods/fml/common/LoadController.java

@@ -183,7 +183,7 @@ public class LoadController
         {
             modObjectList = buildModObjectList();
         }
-        ProgressBar bar = ProgressManager.push(stateEvent.description(), activeModList.size());
+        ProgressBar bar = ProgressManager.push(stateEvent.description(), activeModList.size(), true);
         for (ModContainer mc : activeModList)
         {
             bar.step(mc.getName());

fml/src/main/java/cpw/mods/fml/common/ProgressManager.java

@@ -19,9 +19,21 @@ public class ProgressManager
      */
     @Deprecated
     public static ProgressBar push(String title, int steps)
+    {
+        return push(title, steps, false);
+    }
+    /**
+     * @deprecated not a stable API, will break, don't use this yet
+     */
+    @Deprecated
+    public static ProgressBar push(String title, int steps, boolean timeEachStep)
     {
         ProgressBar bar = new ProgressBar(title, steps);
         bars.add(bar);
+        if (timeEachStep)
+        {
+            bar.timeEachStep();
+        }
         FMLCommonHandler.instance().processWindowMessages();
         return bar;
     }
@@ -34,6 +46,16 @@ public class ProgressManager
     {
         if(bar.getSteps() != bar.getStep()) throw new IllegalStateException("can't pop unfinished ProgressBar " + bar.getTitle());
         bars.remove(bar);
+        if (bar.getSteps() != 0)
+        {
+            long newTime = System.nanoTime();
+            if (bar.timeEachStep)
+                FMLLog.fine("Bar Step: %s - %s took %.3fs", bar.getTitle(), bar.getMessage(), ((float)(newTime - bar.lastTime) / 1000000 / 1000));
+            if (bar.getSteps() == 1)
+                FMLLog.fine("Bar Finished: %s - %s took %.3fs", bar.getTitle(), bar.getMessage(), ((float)(newTime - bar.startTime) / 1000000 / 1000));
+            else
+                FMLLog.fine("Bar Finished: %s took %.3fs", bar.getTitle(), ((float)(newTime - bar.startTime) / 1000000 / 1000));
+        }
         FMLCommonHandler.instance().processWindowMessages();
     }
 
@@ -55,6 +77,9 @@ public class ProgressManager
         private final int steps;
         private volatile int step = 0;
         private volatile String message = "";
+        private boolean timeEachStep = false;
+        private long startTime = System.nanoTime();
+        private long lastTime = startTime;
 
         private ProgressBar(String title, int steps)
         {
@@ -70,6 +95,12 @@ public class ProgressManager
         public void step(String message)
         {
             if(step >= steps) throw new IllegalStateException("too much steps for ProgressBar " + title);
+            if (timeEachStep && step != 0)
+            {
+                long newTime = System.nanoTime();
+                FMLLog.fine("Bar Step: %s - %s took %.3fs", getTitle(), getMessage(), ((float)(newTime - lastTime) / 1000000 / 1000));
+                lastTime = newTime;
+            }
             step++;
             this.message = FMLCommonHandler.instance().stripSpecialChars(message);
             FMLCommonHandler.instance().processWindowMessages();
@@ -94,5 +125,10 @@ public class ProgressManager
         {
             return message;
         }
+
+        public void timeEachStep()
+        {
+            this.timeEachStep = true;
+        }
     }
-}
+}