diff --git a/src/Makefile b/src/Makefile
index 7e5e3e9..48c029a 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -113,7 +113,7 @@ test_irq.elf: test_irq.c libsys.a
 	$(OBJCOPY) -O ihex -I binary $@.flash.bin $@.hex
 
 dhry.elf: dhry_1.c dhry_2.c dhry.h libsys.a
-	$(CC) $(CFLAGS) -o $@ -DHZ=1000 dhry_1.c dhry_2.c $(LIBS) >$@.map
+	$(CC) $(CFLAGS) -O3 -o $@ -DHZ=1000 dhry_1.c dhry_2.c $(LIBS) >$@.map
 	$(OBJDUMP) -d $@ > $@.dis
 	$(OBJCOPY) $@ -O binary $@.bin
 	$(OBJCOPY) -O srec $@ $@.srec
diff --git a/src/dhry_1.c b/src/dhry_1.c
index 9a803f5..a9c1b07 100644
--- a/src/dhry_1.c
+++ b/src/dhry_1.c
@@ -104,10 +104,10 @@ main ()
         /* Warning: With 16-Bit processors and Number_Of_Runs > 32000,  */
         /* overflow may occur for this array element.                   */
 
-  /*
   printf ("\n");
   printf ("Dhrystone Benchmark, Version 2.1 (Language: C)\n");
   printf ("\n");
+  /*
   if (Reg)
   {
     printf ("Program compiled with 'register' attribute\n");
@@ -208,7 +208,6 @@ main ()
 #ifdef MSC_CLOCK
   End_Time = clock();
 #endif
-  /*
   printf ("Execution ends\n");
   printf ("\n");
   printf ("Final values of the variables used in the benchmark:\n");
@@ -262,7 +261,6 @@ main ()
   printf ("        should be:   DHRYSTONE PROGRAM, 2'ND STRING\n");
   printf ("\n");
 
-*/
   User_Time = End_Time - Begin_Time;
 
   if (User_Time < Too_Small_Time)