diff --git a/UP3DTRANSCODE/make.sh b/UP3DTRANSCODE/make.sh
index 5259a6f..55784e3 100755
--- a/UP3DTRANSCODE/make.sh
+++ b/UP3DTRANSCODE/make.sh
@@ -12,7 +12,7 @@ fi
 
 if [[ "$OSTYPE" == "msys" ]]; then
 
-$CC -std=c99 -O2 \
+$CC -std=c99 -Ofast -fwhole-program -flto \
     -I../UP3DCOMMON \
     -o up3dtranscode.exe up3dconf.c hoststepper.c hostplanner.c gcodeparser.c ../UP3DCOMMON/up3ddata.c umcwriter.c up3dtranscode.c -lm
 
@@ -21,7 +21,7 @@ $STRIP up3dtranscode.exe
 elif [[ "$OSTYPE" == "darwin"* ]]; then
 
 
-$CC -std=c99 -O2 \
+$CC -std=c99 -Ofast \
     -I../UP3DCOMMON \
     -framework IOKit \
     -framework CoreFoundation \
@@ -31,9 +31,9 @@ $CC -std=c99 -O2 \
 $STRIP up3dtranscode
 
 
-elif [[ "$OSTYPE" == "linux-gnu" ]]; then
+elif [[ "$OSTYPE" == "linux-gnu"* ]]; then
 
-$CC -std=c99 -O2 \
+$CC -std=c99 -Ofast -fwhole-program -flto \
     -I../UP3DCOMMON \
     -o up3dtranscode up3dconf.c hoststepper.c hostplanner.c gcodeparser.c ../UP3DCOMMON/up3ddata.c umcwriter.c up3dtranscode.c -lm
 
diff --git a/UP3DTRANSCODE/umcwriter.c b/UP3DTRANSCODE/umcwriter.c
index bd91b53..1ce6ffd 100644
--- a/UP3DTRANSCODE/umcwriter.c
+++ b/UP3DTRANSCODE/umcwriter.c
@@ -32,6 +32,7 @@ static double  umcwriter_Z;
 static double  umcwriter_Z_height;
 static double  umcwriter_print_time;
 static char    umcwriter_machine_type;
+static int32_t umcwriter_bed_temp;
 
 #ifdef X_REF_CALC
 static double  g_r0, g_r1, g_r2;
@@ -51,7 +52,8 @@ bool umcwriter_init(const char* filename, const double heightZ, const char machi
   umcwriter_Z_height = heightZ;
   umcwriter_print_time = 0;
   umcwriter_machine_type = machine_type;
-  
+  umcwriter_bed_temp = 0;
+
   st_reset();
   plan_reset();
 
@@ -163,11 +165,12 @@ void umcwriter_finish()
         blk.pdat2.l = (time*100)/umcwriter_print_time;
         change=true;
       }
-      
+
       if( change )
       {
         fseek( umcwriter_file, -sizeof(UP3D_BLK), SEEK_CUR );
         fwrite( &blk, sizeof(UP3D_BLK), 1, umcwriter_file );
+        fseek( umcwriter_file, 0, SEEK_CUR ); //workaround for windows bug
       }
     }
   }
@@ -422,12 +425,12 @@ void umcwriter_set_bed_temp(int32_t temp, bool wait)
   UP3D_PROG_BLK_SetParameter(&blk,PARA_HEATER_BED_ON,(temp)?1:0);
   _umcwriter_write_file(&blk, 1);
 
-  if(wait)
+  if(wait && (temp>umcwriter_bed_temp) ) //only wait if new temperature is higher
   {
     UP3D_PROG_BLK_SetParameter(&blk,PARA_RED_BLUE_BLINK,400);
     _umcwriter_write_file(&blk, 1);
 
-    uint32_t waitsec = (temp/settings.heatbed_wait_factor)*60; 
+    uint32_t waitsec = ((temp-umcwriter_bed_temp)/settings.heatbed_wait_factor)*60;
     umcwriter_pause(waitsec*1000);
 
     UP3D_PROG_BLK_SetParameter(&blk,PARA_RED_BLUE_BLINK,200);
@@ -435,6 +438,7 @@ void umcwriter_set_bed_temp(int32_t temp, bool wait)
 
     umcwriter_set_report_data(-1,-1);
   }
+  umcwriter_bed_temp = temp;
 }
 
 void umcwriter_set_report_data(int32_t layer, double height)
diff --git a/UP3DTRANSCODE/up3dtranscode.c b/UP3DTRANSCODE/up3dtranscode.c
index ad4b890..4fbece2 100644
--- a/UP3DTRANSCODE/up3dtranscode.c
+++ b/UP3DTRANSCODE/up3dtranscode.c
@@ -84,8 +84,8 @@ int main(int argc, char *argv[])
   }
 
   gcp_reset();
-  
-  char line[1024];  
+
+  char line[1024];
   while( fgets(line,sizeof(line),fgcode) )
     if( !gcp_process_line(line) )
       return 0;
@@ -100,6 +100,6 @@ int main(int argc, char *argv[])
   int m = print_time/60; printf("%02dm:",m); print_time -= m*60;
   printf("%02ds",print_time);
   printf(" / Nozzle Height: %.2fmm\n", nozzle_height);
-  
-  return 0; 
+
+  return 0;
 }