diff --git a/aqhome/msg/msg_memstats.c b/aqhome/msg/msg_memstats.c
index e8e9e2e..facfeaf 100644
--- a/aqhome/msg/msg_memstats.c
+++ b/aqhome/msg/msg_memstats.c
@@ -26,9 +26,8 @@
 #define AQH_MSG_OFFS_MEMSTATS_MAXBUFFERSUSED 11 /* 1 byte */
 #define AQH_MSG_OFFS_MEMSTATS_SENDNOBUFFER   12 /* 2 bytes */
 #define AQH_MSG_OFFS_MEMSTATS_RECVNOBUFFER   14 /* 2 bytes */
-#define AQH_MSG_OFFS_MEMSTATS_IDLEPERCENT    16 /* 1 byte */
 
-#define AQH_MSG_MEMSTATS_MINSIZE          (AQH_MSG_OFFS_ALL_DATA_BEGIN+AQH_MSG_OFFS_MEMSTATS_IDLEPERCENT+1)
+#define AQH_MSG_MEMSTATS_MINSIZE          (AQH_MSG_OFFS_ALL_DATA_BEGIN+AQH_MSG_OFFS_MEMSTATS_RECVNOBUFFER+2)
 
 
 
@@ -80,23 +79,15 @@ uint16_t AQH_MemStatsMsg_GetRecvNoBufferErrors(const GWEN_MSG *msg)
 
 
 
-uint8_t AQH_MemStatsMsg_GetIdlePercentage(const GWEN_MSG *msg)
-{
-  return AQH_NodeMsg_GetUint8At(msg, AQH_MSG_OFFS_ALL_DATA_BEGIN+AQH_MSG_OFFS_MEMSTATS_IDLEPERCENT, 0);
-}
-
-
-
 void AQH_MemStatsMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText)
 {
   GWEN_Buffer_AppendArgs(dbuf,
-			 "0x%02x->0x%02x: MEMSTATS %s (uid=0x%08x, uptime=%d, idle=%d, stackptr=%d[%04x], buffers used=%d(max=%d), no sendbuf errs=%d, no recvbuf=%d)\n",
+			 "0x%02x->0x%02x: MEMSTATS %s (uid=0x%08x, uptime=%d, stackptr=%d[%04x], buffers used=%d(max=%d), no sendbuf errs=%d, no recvbuf=%d)\n",
 			 AQH_NodeMsg_GetSourceAddress(msg),
 			 AQH_NodeMsg_GetDestAddress(msg),
 			 sText,
 			 (unsigned int) AQH_MemStatsMsg_GetUid(msg),
                          AQH_MemStatsMsg_GetSeconds(msg),
-                         AQH_MemStatsMsg_GetIdlePercentage(msg),
 			 AQH_MemStatsMsg_GetStackPtr(msg),
 			 AQH_MemStatsMsg_GetStackPtr(msg),
 			 AQH_MemStatsMsg_GetBuffersUsed(msg),
diff --git a/aqhome/msg/msg_sysstats.c b/aqhome/msg/msg_sysstats.c
index 273049f..203aea9 100644
--- a/aqhome/msg/msg_sysstats.c
+++ b/aqhome/msg/msg_sysstats.c
@@ -23,9 +23,8 @@
 #define AQH_MSG_OFFS_SYSSTATS_UID             4  /* 4 bytes */
 #define AQH_MSG_OFFS_SYSSTATS_COMIRQS         8  /* 2 bytes */
 #define AQH_MSG_OFFS_SYSSTATS_TIMERIRQS      10  /* 2 bytes */
-#define AQH_MSG_OFFS_SYSSTATS_IDLEPERCENT    12  /* 1 byte */
 
-#define AQH_MSG_MEMSTATS_MINSIZE          (AQH_MSG_OFFS_ALL_DATA_BEGIN+AQH_MSG_OFFS_SYSSTATS_IDLEPERCENT+1)
+#define AQH_MSG_MEMSTATS_MINSIZE          (AQH_MSG_OFFS_ALL_DATA_BEGIN+AQH_MSG_OFFS_SYSSTATS_TIMERIRQS+2)
 
 
 
@@ -56,23 +55,15 @@ uint16_t AQH_SysStatsMsg_GetTimerInterrupts(const GWEN_MSG *msg)
 
 
 
-uint8_t AQH_SysStatsMsg_GetIdlePercentage(const GWEN_MSG *msg)
-{
-  return AQH_NodeMsg_GetUint8At(msg, AQH_MSG_OFFS_ALL_DATA_BEGIN+AQH_MSG_OFFS_SYSSTATS_IDLEPERCENT, 0);
-}
-
-
-
 void AQH_SysStatsMsg_DumpToBuffer(const GWEN_MSG *msg, GWEN_BUFFER *dbuf, const char *sText)
 {
   GWEN_Buffer_AppendArgs(dbuf,
-			 "0x%02x->0x%02x: SYSSTATS %s (uid=0x%08x, uptime=%d, idle=%d, com irqs=%d, timer irqs=%d)\n",
+			 "0x%02x->0x%02x: SYSSTATS %s (uid=0x%08x, uptime=%d, com irqs=%d, timer irqs=%d)\n",
 			 AQH_NodeMsg_GetSourceAddress(msg),
 			 AQH_NodeMsg_GetDestAddress(msg),
 			 sText,
 			 (unsigned int) AQH_SysStatsMsg_GetUid(msg),
                          AQH_SysStatsMsg_GetSeconds(msg),
-                         AQH_SysStatsMsg_GetIdlePercentage(msg),
                          AQH_SysStatsMsg_GetComInterrupts(msg),
                          AQH_SysStatsMsg_GetTimerInterrupts(msg));
 }
diff --git a/avr/comproto_memstats.asm b/avr/comproto_memstats.asm
index a6afe61..fd42781 100644
--- a/avr/comproto_memstats.asm
+++ b/avr/comproto_memstats.asm
@@ -34,7 +34,7 @@ CPRO_EnqueueMemStats:
   push xh
     push xl
       mov r16, r6
-      ldi r17, CPRO_PAYLOAD_FLAGS_UID | CPRO_PAYLOAD_FLAGS_SECONDS | (9<<CPRO_PAYLOAD_FLAGS_SHIFT_NUM)
+      ldi r17, CPRO_PAYLOAD_FLAGS_UID | CPRO_PAYLOAD_FLAGS_SECONDS | (8<<CPRO_PAYLOAD_FLAGS_SHIFT_NUM)
       ldi r18, CPRO_CMD_MEMSTATS
       rcall cproBeginMsgWithVariablePayload  ; (R3, R4, R16, R17, R18, R19, R20, R21, X)
       ; payload
@@ -54,12 +54,6 @@ CPRO_EnqueueMemStats:
       st X+, r17                             ; recvNoBuffer
       lds r17, comStatsRecvNoBuffer+1
       st X+, r17
-      push xl
-        push xh
-          rcall Timer_CalcIdle               ; (r16, r17, r18, r24, r25, X)
-        pop xh
-      pop xl
-      st X+, r16
     pop xl
   pop xh
   rcall comCalcAndAddChecksumByte            ; (R16, R17, R18, R19, X)
diff --git a/avr/comproto_sysstats.asm b/avr/comproto_sysstats.asm
index 731fa81..66c011c 100644
--- a/avr/comproto_sysstats.asm
+++ b/avr/comproto_sysstats.asm
@@ -34,7 +34,7 @@ CPRO_EnqueueSysStats:
   push xh
     push xl
       mov r16, r6
-      ldi r17, CPRO_PAYLOAD_FLAGS_UID | CPRO_PAYLOAD_FLAGS_SECONDS | (9<<CPRO_PAYLOAD_FLAGS_SHIFT_NUM)
+      ldi r17, CPRO_PAYLOAD_FLAGS_UID | CPRO_PAYLOAD_FLAGS_SECONDS | (4<<CPRO_PAYLOAD_FLAGS_SHIFT_NUM)
       ldi r18, CPRO_CMD_SYSSTATS
       rcall cproBeginMsgWithVariablePayload  ; (R3, R4, R16, R17, R18, R19, R20, R21, X)
       ; payload
@@ -47,13 +47,6 @@ CPRO_EnqueueSysStats:
       st X+, r17                             ; timer interrupts
       lds r17, timerInterrupts+1
       st X+, r17
-      
-      push xl
-        push xh
-          rcall Timer_CalcIdle               ; (r16, r17, r18, r24, r25, X)
-        pop xh
-      pop xl
-      st X+, r16                             ; idle percentage
     pop xl
   pop xh
   rcall comCalcAndAddChecksumByte            ; (R16, R17, R18, R19, X)
diff --git a/avr/main.asm b/avr/main.asm
index 3bbcf74..5ebf975 100644
--- a/avr/main.asm
+++ b/avr/main.asm
@@ -71,8 +71,6 @@ main_loop:
 ;    cbi PORTA, PORTA2 ; debug (on)
 ;    sbi PORTA, PORTA2 ; debug (off)
 
-    rcall Timer_BeforeSleep
-  
     ; only modify SE, SM1 and SM0
     in r16, MCUCR
     ldi r17, (1<<SE) | (1<<SM1) | (1<<SM0)
@@ -81,7 +79,6 @@ main_loop:
     ori r16, (1<<SE)           ; sleep mode "idle", enable
     out MCUCR, r16
     sleep                      ; sleep, wait for interrupt
-    rcall Timer_AfterSleep
   rjmp main_loop
 
 
diff --git a/avr/timer.asm b/avr/timer.asm
index e6ce355..d1612a8 100644
--- a/avr/timer.asm
+++ b/avr/timer.asm
@@ -16,7 +16,6 @@
 
 .equ TIMER_FLAGS_IF_ADDR = 1
 
-.equ TIMER_STATES_MASK   = 7
 
 
 
@@ -30,9 +29,6 @@ timerModuleTickCounter:      .byte 1
 timerTicksSinceLastRun:      .byte 2
 timerModuleCounterSecs:      .byte 4
 timerInterrupts:             .byte 2
-timerStateBeforeSleep:       .byte 1
-timerStatePos:               .byte 1
-timerStates:                 .byte TIMER_STATES_MASK+1
 timerModuleData_end:
 
 
@@ -248,68 +244,6 @@ timerCallR19R18:
 
 
 
-Timer_AfterSleep:
-  in r16, TCNT0
-  sts timerStateBeforeSleep, r16
-  ret
-
-
-
-Timer_BeforeSleep:
-  in r16, TCNT0   ; read counter value
-  lds r17, timerStateBeforeSleep
-  sub r16, r17
-  brcc Timer_BeforeSleep_l1
-  ldi r17, 98-1
-  add r16, r17
-Timer_BeforeSleep_l1:
-  ldi xl, LOW(timerStates)
-  ldi xh, HIGH(timerStates)
-  lds r18, timerStatePos
-  clr r17
-  add xl, r18
-  adc xh, r17
-  st X, r16
-  inc r18
-  andi r18, TIMER_STATES_MASK
-  sts timerStatePos, r18
-  ret
-
-
-
-; ---------------------------------------------------------------------------
-; Calculate aproximate idle percentage
-;
-; IN:
-; OUT:
-; - R16: approximate idle percentage (between 0 and 97)
-; REGS: r16, r17, r18, r24, r25, X
-
-Timer_CalcIdle:
-  ldi xl, LOW(timerStates)
-  ldi xh, HIGH(timerStates)
-  ldi r18, TIMER_STATES_MASK+1
-  clr r24
-  clr r25
-  clr r17
-Timer_CalcIdle_loop:
-    ld r16, X+
-    add r24, r16
-    adc r25, r17
-    dec r18
-  brne Timer_CalcIdle_loop
-  lsr r25
-  ror r24
-  lsr r25
-  ror r24
-  lsr r25
-  ror r24
-  mov r16, r24
-  ret
-
-
-
-
 ; ---------------------------------------------------------------------------
 ; OC0A interrupt handler
 ;