diff --git a/Makefile b/Makefile
index e16ea2e..341524d 100644
--- a/Makefile
+++ b/Makefile
@@ -5,8 +5,8 @@
 
 # Compiler options here.
 ifeq ($(USE_OPT),)
-#  USE_OPT = -O2 -fno-inline-small-functions -ggdb -fomit-frame-pointer -falign-functions=16 --specs=nano.specs -fstack-usage
-  USE_OPT = -fno-inline-small-functions -ggdb -fomit-frame-pointer -falign-functions=16 --specs=nano.specs -fstack-usage
+  USE_OPT = -O2 -fno-inline-small-functions -ggdb -fomit-frame-pointer -falign-functions=16 --specs=nano.specs -fstack-usage
+#  USE_OPT = -fno-inline-small-functions -ggdb -fomit-frame-pointer -falign-functions=16 --specs=nano.specs -fstack-usage
 endif
 
 # C specific options here (added to USE_OPT).
diff --git a/nanovna.h b/nanovna.h
index 2c342fc..8dbdef0 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -610,7 +610,7 @@ void SI4432_SetReference(int freq);
 
 // Speed profile definition
 #define START_PROFILE   systime_t time = chVTGetSystemTimeX();
-#define STOP_PROFILE    {char string_buf[12];plot_printf(string_buf, sizeof string_buf, "T:%06d", chVTGetSystemTimeX() - time);ili9341_drawstringV(string_buf, 1, 60);}
+#define STOP_PROFILE    {char string_buf[12];plot_printf(string_buf, sizeof string_buf, "T:%06d", chVTGetSystemTimeX() - time);ili9341_drawstringV(string_buf, 1, 180);}
 // Macros for convert define value to string
 #define STR1(x)  #x
 #define define_to_STR(x)  STR1(x)
diff --git a/sa_core.c b/sa_core.c
index b279e35..a4720aa 100644
--- a/sa_core.c
+++ b/sa_core.c
@@ -577,6 +577,8 @@ static bool sweep(bool break_on_operation)
 //again:
   for (int i = 0; i < sweep_points; i++) {
     RSSI = perform(break_on_operation, i, frequencies[i], setting_tracking);
+
+//START_PROFILE
     // back to toplevel to handle ui operation
     if (operation_requested && break_on_operation)
       return false;
@@ -611,6 +613,7 @@ static bool sweep(bool break_on_operation)
     }
     if (temp_min_level > actual_t[i])
       temp_min_level = actual_t[i];
+//STOP_PROFILE
   }
 //  if (setting_spur == 1) {
 //    setting_spur = -1;
diff --git a/si4432.c b/si4432.c
index 0f56863..a9ae215 100644
--- a/si4432.c
+++ b/si4432.c
@@ -215,7 +215,7 @@ void SI4432_Set_Frequency ( long Freq ) {
   int N = Freq / 10000000;
   Carrier = ( 4 * ( Freq - N * 10000000 )) / 625;
   int Freq_Band = ( N - 24 ) | ( hbsel << 5 ) | ( sbsel << 6 );
-#if 1
+#if 0
   SI4432_Write_Byte ( 0x75, Freq_Band );
   SI4432_Write_Byte ( 0x76, (Carrier>>8) & 0xFF );
   SI4432_Write_Byte ( 0x77, Carrier & 0xFF  );
@@ -237,15 +237,17 @@ float SI4432_RSSI(uint32_t i, int s)
     RSSI_RAW = Si446x_getRSSI();
   } else
 #endif
+//START_PROFILE
     SI4432_Sel = s;
     chThdSleepMicroseconds(actualStepDelay);
     RSSI_RAW = (unsigned char)SI4432_Read_Byte( 0x26 ) ;
  //   if (MODE_INPUT(setting_mode) && RSSI_RAW == 0)
  //     SI4432_Init();
-  float dBm = 0.5 * RSSI_RAW - 120.0 ;
+  float dBm = (RSSI_RAW-240)/2.0;
 #ifdef __SIMULATION__
   dBm = Simulated_SI4432_RSSI(i,s);
 #endif
+//STOP_PROFILE
   // Serial.println(dBm,2);
   return dBm ;
 }
diff --git a/ui_sa.c b/ui_sa.c
index e7b3c0d..d9d5eb6 100644
--- a/ui_sa.c
+++ b/ui_sa.c
@@ -187,7 +187,7 @@ static void menu_mode_cb(int item, uint8_t data)
 {
   (void)data;
   SetMode(item-1);
-  draw_cal_status();
+//  draw_cal_status();
   switch (item) {
   case 1:
     menu_push_submenu(menu_top);
@@ -202,7 +202,7 @@ static void menu_mode_cb(int item, uint8_t data)
     menu_push_submenu(menu_highoutputmode);
     break;
   }
-  draw_cal_status();
+//  draw_cal_status();
 }
 
 extern int dirty;