diff --git a/radio/src/gui/view_statistics.cpp b/radio/src/gui/view_statistics.cpp
index 4e192c360..99b0e032a 100644
--- a/radio/src/gui/view_statistics.cpp
+++ b/radio/src/gui/view_statistics.cpp
@@ -120,6 +120,10 @@ void menuStatisticsDebug(uint8_t event)
 #if !defined(CPUARM)
       g_tmr1Latency_min = 0xff;
       g_tmr1Latency_max = 0;
+#endif
+#if defined(LUA)
+      maxLuaInterval = 0;
+      maxLuaDuration = 0;
 #endif
       maxMixerDuration  = 0;
       AUDIO_KEYPAD_UP();
@@ -177,14 +181,24 @@ void menuStatisticsDebug(uint8_t event)
     putsTelemetryValue(MENU_DEBUG_COL1_OFS, 4*FH, Coproc_temp, UNIT_TEMPERATURE, LEFT);
     putsTelemetryValue(MENU_DEBUG_COL2_OFS, 4*FH, Coproc_maxtemp, UNIT_TEMPERATURE, LEFT);
   }
-#elif defined(PCBTARANIS) && !defined(SIMU)
-  lcd_putsLeft(4*FH, "Free Mem");
-  lcd_outdezAtt(MENU_DEBUG_COL1_OFS, 4*FH, 0x20020000 - (unsigned int)heap, LEFT);
+#endif
+
+#if defined(PCBTARANIS) && !defined(SIMU)
+  lcd_putsLeft(3*FH, "Free Mem");
+  lcd_outdezAtt(MENU_DEBUG_COL1_OFS, 3*FH, 0x20020000 - (unsigned int)heap, LEFT);
+#endif
+
+#if defined(LUA)
+  lcd_putsLeft(4*FH, "Lua scripts");
+  lcd_putsAtt(MENU_DEBUG_COL1_OFS-1, 4*FH+1, "[Duration]", SMLSIZE);
+  lcd_outdezAtt(lcdLastPos, 4*FH, 10*maxLuaDuration, LEFT);
+  lcd_putsAtt(lcdLastPos+2, 4*FH+1, "[Interval]", SMLSIZE);
+  lcd_outdezAtt(lcdLastPos, 4*FH, 10*maxLuaInterval, LEFT);
 #endif
 
 #if defined(CPUARM)
   lcd_putsLeft(5*FH, STR_TMIXMAXMS);
-  lcd_outdezAtt(MENU_DEBUG_COL1_OFS, 5*FH, (maxMixerDuration)/20, PREC2|LEFT);
+  lcd_outdezAtt(MENU_DEBUG_COL1_OFS, 5*FH, DURATION_MS_PREC2(maxMixerDuration), PREC2|LEFT);
   lcd_puts(lcdLastPos, 5*FH, "ms");
   lcd_putsLeft(6*FH, STR_FREESTACKMINB);
 
@@ -211,7 +225,7 @@ void menuStatisticsDebug(uint8_t event)
   lcd_putsLeft(3*FH, STR_TMR1JITTERUS);
   lcd_outdez8(MENU_DEBUG_COL1_OFS , 3*FH, (g_tmr1Latency_max - g_tmr1Latency_min) /2 );
   lcd_putsLeft(4*FH, STR_TMIXMAXMS);
-  lcd_outdezAtt(MENU_DEBUG_COL1_OFS, 4*FH, (maxMixerDuration*100)/16, PREC2);
+  lcd_outdezAtt(MENU_DEBUG_COL1_OFS, 4*FH, DURATION_MS_PREC2(maxMixerDuration), PREC2);
   lcd_putsLeft(5*FH, STR_FREESTACKMINB);
   lcd_outdezAtt(14*FW, 5*FH, stack_free(), UNSIGN) ;
 #endif
diff --git a/radio/src/lua.cpp b/radio/src/lua.cpp
index ad7485702..2b8bc8e93 100644
--- a/radio/src/lua.cpp
+++ b/radio/src/lua.cpp
@@ -60,10 +60,12 @@ lua_State *L = NULL;
 uint8_t luaState = 0;
 ScriptInternalData scriptInternalData[MAX_SCRIPTS] = { { SCRIPT_NOFILE, 0 } };
 ScriptInternalData standaloneScript = { SCRIPT_NOFILE, 0 };
+uint16_t maxLuaInterval = 0;
+uint16_t maxLuaDuration = 0;
 
 #define PERMANENT_SCRIPTS_MAX_INSTRUCTIONS (1000/100)
 #define MANUAL_SCRIPTS_MAX_INSTRUCTIONS    (10000/100)
-#define SCRIPTS_MAX_HEAP                   100
+#define SCRIPTS_MAX_HEAP                   50
 #define SET_LUA_INSTRUCTIONS_COUNT(x)      (instructionsPercent=0, lua_sethook(L, hook, LUA_MASKCOUNT, x))
 
 static int instructionsPercent = 0;
@@ -1242,6 +1244,14 @@ void luaTask(uint8_t evt)
   lcd_locked = false;
   static uint8_t luaDisplayStatistics = false;
 
+  uint32_t t0 = get_tmr10ms();
+  static uint32_t lastLuaTime = 0;
+  uint16_t interval = (lastLuaTime == 0 ? 0 : (t0 - lastLuaTime));
+  lastLuaTime = t0;
+  if (interval > maxLuaInterval) {
+    maxLuaInterval = interval;
+  }
+
   if (luaState & LUASTATE_STANDALONE_SCRIPT_RUNNING) {
     // standalone script
     if (standaloneScript.state == SCRIPT_OK && standaloneScript.run) {
@@ -1391,4 +1401,9 @@ void luaTask(uint8_t evt)
     TRACE("GC Use: %dbytes", gc);
   }
 #endif
+
+  t0 = get_tmr10ms() - t0;
+  if (t0 > maxLuaDuration) {
+    maxLuaDuration = t0;
+  }
 }
diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index 401bfea50..145aaee3c 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -115,13 +115,14 @@ void loadModelBitmap(char *name, uint8_t *bitmap)
 #if !defined(CPUARM)
 uint8_t g_tmr1Latency_max;
 uint8_t g_tmr1Latency_min;
+uint16_t lastMixerDuration;
 #endif
 
 uint8_t unexpectedShutdown = 0;
 
-/* mixer duration in 1/16ms */
+/* AVR: mixer duration in 1/16ms */
+/* ARM: mixer duration in 0.5us */
 uint16_t maxMixerDuration;
-uint16_t lastMixerDuration;
 
 #if defined(AUDIO) && !defined(CPUARM)
 audioQueue  audio;
diff --git a/radio/src/opentx.h b/radio/src/opentx.h
index 51ed0f684..7e7de1c5a 100644
--- a/radio/src/opentx.h
+++ b/radio/src/opentx.h
@@ -838,10 +838,25 @@ void timerReset(uint8_t idx);
 void flightReset();
 
 extern uint8_t unexpectedShutdown;
+
+extern uint16_t maxMixerDuration;
+
+#if !defined(CPUARM)
 extern uint8_t g_tmr1Latency_max;
 extern uint8_t g_tmr1Latency_min;
-extern uint16_t maxMixerDuration;
 extern uint16_t lastMixerDuration;
+#endif
+
+#if defined(LUA)
+extern uint16_t maxLuaInterval;
+extern uint16_t maxLuaDuration;
+#endif
+
+#if defined(CPUARM)
+  #define DURATION_MS_PREC2(x) ((x)/20)
+#else
+  #define DURATION_MS_PREC2(x) ((x)*100)/16
+#endif
 
 #if defined(THRTRACE)
   #define MAXTRACE (LCD_W - 8)