diff --git a/src/engine/engine.cpp b/src/engine/engine.cpp
index 847824fd..12fe249f 100644
--- a/src/engine/engine.cpp
+++ b/src/engine/engine.cpp
@@ -2668,10 +2668,17 @@ void DivEngine::previewSampleNoLock(int sample, int note, int pStart, int pEnd)
     if (rate<=0) rate=song.sample[sample]->centerRate;
   }
   if (rate<100) rate=100;
+  double rateOrig=rate;
+  sPreview.rateMul=1;
+  while (sPreview.rateMul<0x40000000 && rate<got.rate) {
+    sPreview.rateMul<<=1;
+    rate*=2.0;
+  }
   blip_set_rates(samp_bb,rate,got.rate);
   samp_prevSample=0;
-  sPreview.rate=rate;
+  sPreview.rate=rateOrig;
   sPreview.pos=(sPreview.pBegin>=0)?sPreview.pBegin:0;
+  sPreview.posSub=0;
   sPreview.sample=sample;
   sPreview.wave=-1;
   sPreview.dir=false;
@@ -2696,10 +2703,17 @@ void DivEngine::previewWaveNoLock(int wave, int note) {
   blip_clear(samp_bb);
   double rate=song.wave[wave]->len*((song.tuning*0.0625)*pow(2.0,(double)(note+3)/12.0));
   if (rate<100) rate=100;
+  double rateOrig=rate;
+  sPreview.rateMul=1;
+  while (sPreview.rateMul<0x40000000 && rate<got.rate) {
+    sPreview.rateMul<<=1;
+    rate*=2.0;
+  }
   blip_set_rates(samp_bb,rate,got.rate);
   samp_prevSample=0;
-  sPreview.rate=rate;
+  sPreview.rate=rateOrig;
   sPreview.pos=0;
+  sPreview.posSub=0;
   sPreview.sample=-1;
   sPreview.wave=wave;
   sPreview.dir=false;
diff --git a/src/engine/engine.h b/src/engine/engine.h
index 85da26ea..d31de903 100644
--- a/src/engine/engine.h
+++ b/src/engine/engine.h
@@ -53,8 +53,8 @@
 #define EXTERN_BUSY_BEGIN_SOFT e->softLocked=true; e->isBusy.lock();
 #define EXTERN_BUSY_END e->isBusy.unlock(); e->softLocked=false;
 
-#define DIV_VERSION "dev152"
-#define DIV_ENGINE_VERSION 152
+#define DIV_VERSION "dev153"
+#define DIV_ENGINE_VERSION 153
 // for imports
 #define DIV_VERSION_MOD 0xff01
 #define DIV_VERSION_FC 0xff02
@@ -414,6 +414,7 @@ class DivEngine {
     int wave;
     int pos;
     int pBegin, pEnd;
+    int rateMul, posSub;
     bool dir;
     SamplePreview():
       rate(0.0),
@@ -422,6 +423,8 @@ class DivEngine {
       pos(0),
       pBegin(-1),
       pEnd(-1),
+      rateMul(1),
+      posSub(0),
       dir(false) {}
   } sPreview;
 
diff --git a/src/engine/fileOps.cpp b/src/engine/fileOps.cpp
index 0ca5dff6..c184d20a 100644
--- a/src/engine/fileOps.cpp
+++ b/src/engine/fileOps.cpp
@@ -2715,6 +2715,15 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
       }
     }
 
+    // SrgaPCM slide compat
+    if (ds.version<153) {
+      for (int i=0; i<ds.systemLen; i++) {
+        if (ds.system[i]==DIV_SYSTEM_SEGAPCM || ds.system[i]==DIV_SYSTEM_SEGAPCM_COMPAT) {
+          ds.systemFlags[i].set("oldSlides",true);
+        }
+      }
+    }
+
     if (active) quitDispatch();
     BUSY_BEGIN_SOFT;
     saveLock.lock();
diff --git a/src/engine/platform/segapcm.cpp b/src/engine/platform/segapcm.cpp
index 9c7f6a63..4557f85e 100644
--- a/src/engine/platform/segapcm.cpp
+++ b/src/engine/platform/segapcm.cpp
@@ -72,7 +72,7 @@ void DivPlatformSegaPCM::tick(bool sysTick) {
       chan[i].handleArp();
     } else if (chan[i].std.arp.had) {
       if (!chan[i].inPorta) {
-        chan[i].baseFreq=(parent->calcArp(chan[i].note,chan[i].std.arp.val)<<6);
+        chan[i].baseFreq=(parent->calcArp(chan[i].note,chan[i].std.arp.val)<<7);
       }
       chan[i].freqChanged=true;
     }
@@ -106,21 +106,22 @@ void DivPlatformSegaPCM::tick(bool sysTick) {
     }
 
     if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
-      chan[i].freq=chan[i].baseFreq+(chan[i].pitch>>1)-64;
+      chan[i].freq=chan[i].baseFreq+(chan[i].pitch)-128+(oldSlides?0:chan[i].pitch2);
       if (!parent->song.oldArpStrategy) {
         if (chan[i].fixedArp) {
-          chan[i].freq=(chan[i].baseNoteOverride<<6)+(chan[i].pitch>>1)-64+chan[i].pitch2;
+          chan[i].freq=(chan[i].baseNoteOverride<<7)+chan[i].pitch-128+(chan[i].pitch2<<(oldSlides?1:0));
         } else {
-          chan[i].freq+=chan[i].arpOff<<6;
+          chan[i].freq+=chan[i].arpOff<<7;
         }
       }
+      if (oldSlides) chan[i].freq&=~1;
       if (chan[i].furnacePCM) {
         double off=1.0;
         if (chan[i].pcm.sample>=0 && chan[i].pcm.sample<parent->song.sampleLen) {
           DivSample* s=parent->getSample(chan[i].pcm.sample);
           off=(double)s->centerRate/8363.0;
         }
-        chan[i].pcm.freq=MIN(255,(15625+(off*parent->song.tuning*pow(2.0,double(chan[i].freq+256)/(64.0*12.0)))*255)/31250)+chan[i].pitch2;
+        chan[i].pcm.freq=MIN(255,(15625+(off*parent->song.tuning*pow(2.0,double(chan[i].freq+512)/(128.0*12.0)))*255)/31250)+(oldSlides?chan[i].pitch2:0);
         rWrite(7+(i<<3),chan[i].pcm.freq);
       }
       chan[i].freqChanged=false;
@@ -201,7 +202,7 @@ int DivPlatformSegaPCM::dispatch(DivCommand c) {
         }
         if (c.value!=DIV_NOTE_NULL) {
           chan[c.chan].note=c.value;
-          chan[c.chan].baseFreq=(c.value<<6);
+          chan[c.chan].baseFreq=(c.value<<7);
           chan[c.chan].freqChanged=true;
         }
         chan[c.chan].furnacePCM=true;
@@ -289,17 +290,18 @@ int DivPlatformSegaPCM::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_NOTE_PORTA: {
-      int destFreq=(c.value2<<6);
+      int destFreq=(c.value2<<7);
       int newFreq;
+      int mul=(oldSlides || parent->song.linearPitch!=2)?8:1;
       bool return2=false;
       if (destFreq>chan[c.chan].baseFreq) {
-        newFreq=chan[c.chan].baseFreq+c.value*4;
+        newFreq=chan[c.chan].baseFreq+c.value*mul;
         if (newFreq>=destFreq) {
           newFreq=destFreq;
           return2=true;
         }
       } else {
-        newFreq=chan[c.chan].baseFreq-c.value*4;
+        newFreq=chan[c.chan].baseFreq-c.value*mul;
         if (newFreq<=destFreq) {
           newFreq=destFreq;
           return2=true;
@@ -314,7 +316,7 @@ int DivPlatformSegaPCM::dispatch(DivCommand c) {
       break;
     }
     case DIV_CMD_LEGATO: {
-      chan[c.chan].baseFreq=(c.value<<6);
+      chan[c.chan].baseFreq=(c.value<<7);
       chan[c.chan].freqChanged=true;
       break;
     }
@@ -337,7 +339,7 @@ int DivPlatformSegaPCM::dispatch(DivCommand c) {
       return 127;
       break;
     case DIV_CMD_PRE_PORTA:
-      if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will && !NEW_ARP_STRAT) chan[c.chan].baseFreq=(chan[c.chan].note<<6);
+      if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will && !NEW_ARP_STRAT) chan[c.chan].baseFreq=(chan[c.chan].note<<7);
       chan[c.chan].inPorta=c.value;
       break;
     case DIV_CMD_PRE_NOTE:
@@ -504,6 +506,8 @@ void DivPlatformSegaPCM::setFlags(const DivConfig& flags) {
   for (int i=0; i<16; i++) {
     oscBuf[i]->rate=rate;
   }
+
+  oldSlides=flags.getBool("oldSlides",false);
 }
 
 int DivPlatformSegaPCM::getOutputCount() {
diff --git a/src/engine/platform/segapcm.h b/src/engine/platform/segapcm.h
index 9e2ad5df..b818306b 100644
--- a/src/engine/platform/segapcm.h
+++ b/src/engine/platform/segapcm.h
@@ -65,6 +65,7 @@ class DivPlatformSegaPCM: public DivDispatch {
     segapcm_device pcm;
     int delay;
     int pcmL, pcmR, pcmCycles;
+    bool oldSlides;
     unsigned char sampleBank;
     unsigned char lastBusy;
 
diff --git a/src/engine/playback.cpp b/src/engine/playback.cpp
index 1ca9df58..808e2b15 100644
--- a/src/engine/playback.cpp
+++ b/src/engine/playback.cpp
@@ -1541,10 +1541,13 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
           samp_temp=0;
         } else {
           samp_temp=s->data16[sPreview.pos];
-          if (sPreview.dir) {
-            sPreview.pos--;
-          } else {
-            sPreview.pos++;
+          if (--sPreview.posSub<=0) {
+            sPreview.posSub=sPreview.rateMul;
+            if (sPreview.dir) {
+              sPreview.pos--;
+            } else {
+              sPreview.pos++;
+            }
           }
         }
         blip_add_delta(samp_bb,i,samp_temp-samp_prevSample);
@@ -1649,8 +1652,11 @@ void DivEngine::nextBuf(float** in, float** out, int inChans, int outChans, unsi
         } else {
           samp_temp=((MIN(wave->data[sPreview.pos],wave->max)<<14)/wave->max)-8192;
         }
-        if (++sPreview.pos>=wave->len) {
-          sPreview.pos=0;
+        if (--sPreview.posSub<=0) {
+          sPreview.posSub=sPreview.rateMul;
+          if (++sPreview.pos>=wave->len) {
+            sPreview.pos=0;
+          }
         }
         blip_add_delta(samp_bb,i,samp_temp-samp_prevSample);
         samp_prevSample=samp_temp;
diff --git a/src/gui/debugWindow.cpp b/src/gui/debugWindow.cpp
index ae1a1dfc..7eb3906a 100644
--- a/src/gui/debugWindow.cpp
+++ b/src/gui/debugWindow.cpp
@@ -540,9 +540,23 @@ void FurnaceGUI::drawDebug() {
     }
     if (ImGui::TreeNode("Performance")) {
       double perfFreq=SDL_GetPerformanceFrequency()/1000000.0;
+      int lastProcTime=(int)e->processTime/1000;
+      TAAudioDesc& audioGot=e->getAudioDescGot();
+
+      ImGui::Text("video frame: %.0fµs",ImGui::GetIO().DeltaTime*1000000.0);
+      ImGui::Text("audio frame: %.0fµs",1000000.0*(double)audioGot.bufsize/(double)audioGot.rate);
+      ImGui::Separator();
+
+      ImGui::Text("audio: %dµs",lastProcTime);
       ImGui::Text("render: %.0fµs",(double)renderTimeDelta/perfFreq);
       ImGui::Text("layout: %.0fµs",(double)layoutTimeDelta/perfFreq);
       ImGui::Text("event: %.0fµs",(double)eventTimeDelta/perfFreq);
+      ImGui::Separator();
+
+      ImGui::Text("details:");
+      for (int i=0; i<perfMetricsLastLen; i++) {
+        ImGui::Text("%s: %.0fµs",perfMetricsLast[i].name,(double)perfMetricsLast[i].elapsed/perfFreq);
+      }
       ImGui::TreePop();
     }
     if (ImGui::TreeNode("Settings")) {
diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index 39872f3f..1f1ce052 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -3271,7 +3271,62 @@ bool FurnaceGUI::detectOutOfBoundsWindow() {
   return false;
 }
 
+#define DECLARE_METRIC(_n) \
+  int __perfM##_n;
+
+#define MEASURE_BEGIN(_n) \
+  __perfM##_n=SDL_GetPerformanceCounter();
+
+#define MEASURE_END(_n) \
+  if (perfMetricsLen<64) { \
+    perfMetrics[perfMetricsLen++]=FurnaceGUIPerfMetric(#_n,SDL_GetPerformanceCounter()-__perfM##_n); \
+  }
+
+#define MEASURE(_n,_x) \
+  MEASURE_BEGIN(_n) \
+  _x; \
+  MEASURE_END(_n)
+
 bool FurnaceGUI::loop() {
+  DECLARE_METRIC(calcChanOsc)
+  DECLARE_METRIC(mobileControls)
+  DECLARE_METRIC(mobileOrderSel)
+  DECLARE_METRIC(subSongs)
+  DECLARE_METRIC(findReplace)
+  DECLARE_METRIC(spoiler)
+  DECLARE_METRIC(pattern)
+  DECLARE_METRIC(editControls)
+  DECLARE_METRIC(speed)
+  DECLARE_METRIC(grooves)
+  DECLARE_METRIC(songInfo)
+  DECLARE_METRIC(orders)
+  DECLARE_METRIC(intro)
+  DECLARE_METRIC(sampleList)
+  DECLARE_METRIC(sampleEdit)
+  DECLARE_METRIC(waveList)
+  DECLARE_METRIC(waveEdit)
+  DECLARE_METRIC(insList)
+  DECLARE_METRIC(insEdit)
+  DECLARE_METRIC(mixer)
+  DECLARE_METRIC(readOsc)
+  DECLARE_METRIC(osc)
+  DECLARE_METRIC(chanOsc)
+  DECLARE_METRIC(volMeter)
+  DECLARE_METRIC(settings)
+  DECLARE_METRIC(debug)
+  DECLARE_METRIC(stats)
+  DECLARE_METRIC(compatFlags)
+  DECLARE_METRIC(piano)
+  DECLARE_METRIC(notes)
+  DECLARE_METRIC(channels)
+  DECLARE_METRIC(patManager)
+  DECLARE_METRIC(sysManager)
+  DECLARE_METRIC(clock)
+  DECLARE_METRIC(regView)
+  DECLARE_METRIC(log)
+  DECLARE_METRIC(effectList)
+  DECLARE_METRIC(popup)
+
 #ifdef IS_MOBILE
   bool doThreadedInput=true;
 #else
@@ -3293,6 +3348,11 @@ bool FurnaceGUI::loop() {
       drawHalt=0;
       if (settings.powerSave) SDL_WaitEventTimeout(NULL,500);
     }
+
+    memcpy(perfMetricsLast,perfMetrics,64*sizeof(FurnaceGUIPerfMetric));
+    perfMetricsLastLen=perfMetricsLen;
+    perfMetricsLen=0;
+
     eventTimeBegin=SDL_GetPerformanceCounter();
     bool updateWindow=false;
     if (injectBackUp) {
@@ -4181,83 +4241,85 @@ bool FurnaceGUI::loop() {
       ImGui::EndMainMenuBar();
     }
 
-    calcChanOsc();
+    MEASURE(calcChanOsc,calcChanOsc());
 
     if (mobileUI) {
       globalWinFlags=ImGuiWindowFlags_NoTitleBar|ImGuiWindowFlags_NoMove|ImGuiWindowFlags_NoResize|ImGuiWindowFlags_NoBringToFrontOnFocus;
       //globalWinFlags=ImGuiWindowFlags_NoTitleBar;
       // scene handling goes here!
-      drawMobileControls();
+      MEASURE(mobileControls,drawMobileControls());
       switch (mobScene) {
         case GUI_SCENE_ORDERS:
           ordersOpen=true;
           curWindow=GUI_WINDOW_ORDERS;
-          drawOrders();
+          MEASURE(orders,drawOrders());
           break;
         case GUI_SCENE_INSTRUMENT:
           insEditOpen=true;
           curWindow=GUI_WINDOW_INS_EDIT;
-          drawInsEdit();
-          drawPiano();
+          MEASURE(insEdit,drawInsEdit());
+          MEASURE(piano,drawPiano());
           break;
         case GUI_SCENE_WAVETABLE:
           waveEditOpen=true;
           curWindow=GUI_WINDOW_WAVE_EDIT;
-          drawWaveEdit();
-          drawPiano();
+          MEASURE(waveEdit,drawWaveEdit());
+          MEASURE(piano,drawPiano());
           break;
         case GUI_SCENE_SAMPLE:
           sampleEditOpen=true;
           curWindow=GUI_WINDOW_SAMPLE_EDIT;
-          drawSampleEdit();
-          drawPiano();
+          MEASURE(sampleEdit,drawSampleEdit());
+          MEASURE(piano,drawPiano());
           break;
         case GUI_SCENE_CHANNELS:
           channelsOpen=true;
           curWindow=GUI_WINDOW_CHANNELS;
-          drawChannels();
+          MEASURE(channels,drawChannels());
           break;
         case GUI_SCENE_CHIPS:
           sysManagerOpen=true;
           curWindow=GUI_WINDOW_SYS_MANAGER;
-          drawSysManager();
+          MEASURE(sysManager,drawSysManager());
           break;
         case GUI_SCENE_MIXER:
           mixerOpen=true;
           curWindow=GUI_WINDOW_MIXER;
-          drawMixer();
+          MEASURE(mixer,drawMixer());
           break;
         default:
           patternOpen=true;
           curWindow=GUI_WINDOW_PATTERN;
-          drawPattern();
-          drawPiano();
-          drawMobileOrderSel();
+          MEASURE(pattern,drawPattern());
+          MEASURE(piano,drawPiano());
+          MEASURE(mobileOrderSel,drawMobileOrderSel());
 
           globalWinFlags=0;
-          drawFindReplace();
+          MEASURE(findReplace,drawFindReplace());
           break;
       }
 
       globalWinFlags=0;
-      drawSettings();
-      drawDebug();
-      drawLog();
-      drawCompatFlags();
-      drawStats();
+      MEASURE(settings,drawSettings());
+      MEASURE(debug,drawDebug());
+      MEASURE(log,drawLog());
+      MEASURE(compatFlags,drawCompatFlags());
+      MEASURE(stats,drawStats());
     } else {
       globalWinFlags=0;
       ImGui::DockSpaceOverViewport(NULL,lockLayout?(ImGuiDockNodeFlags_NoWindowMenuButton|ImGuiDockNodeFlags_NoMove|ImGuiDockNodeFlags_NoResize|ImGuiDockNodeFlags_NoCloseButton|ImGuiDockNodeFlags_NoDocking|ImGuiDockNodeFlags_NoDockingSplitMe|ImGuiDockNodeFlags_NoDockingSplitOther):0);
 
-      drawSubSongs();
-      drawFindReplace();
-      drawSpoiler();
-      drawPattern();
-      drawEditControls();
-      drawSpeed();
-      if (!basicMode) drawGrooves();
-      drawSongInfo();
-      drawOrders();
+      MEASURE(subSongs,drawSubSongs());
+      MEASURE(findReplace,drawFindReplace());
+      MEASURE(spoiler,drawSpoiler());
+      MEASURE(pattern,drawPattern());
+      MEASURE(editControls,drawEditControls());
+      MEASURE(speed,drawSpeed());
+      if (!basicMode) {
+        MEASURE(grooves,drawGrooves());
+      }
+      MEASURE(songInfo,drawSongInfo());
+      MEASURE(orders,drawOrders());
       if (introMonOpen) {
         int totalTicks=e->getTotalTicks();
         int totalSeconds=e->getTotalSeconds();
@@ -4269,36 +4331,38 @@ bool FurnaceGUI::loop() {
 
         if (e->isPlaying()) monitorPos+=ImGui::GetIO().DeltaTime;
       }
-      drawSampleList();
-      drawSampleEdit();
-      drawWaveList();
-      drawWaveEdit();
-      drawInsList();
-      drawInsEdit();
-      drawMixer();
+      MEASURE(sampleList,drawSampleList());
+      MEASURE(sampleEdit,drawSampleEdit());
+      MEASURE(waveList,drawWaveList());
+      MEASURE(waveEdit,drawWaveEdit());
+      MEASURE(insList,drawInsList());
+      MEASURE(insEdit,drawInsEdit());
+      MEASURE(mixer,drawMixer());
 
-      readOsc();
+      MEASURE(readOsc,readOsc());
 
-      drawOsc();
-      drawChanOsc();
-      drawVolMeter();
-      drawSettings();
-      drawDebug();
-      drawStats();
-      if (!basicMode) drawCompatFlags();
-      drawPiano();
-      drawNotes();
+      MEASURE(osc,drawOsc());
+      MEASURE(chanOsc,drawChanOsc());
+      MEASURE(volMeter,drawVolMeter());
+      MEASURE(settings,drawSettings());
+      MEASURE(debug,drawDebug());
+      MEASURE(stats,drawStats());
       if (!basicMode) {
-        drawChannels();
+        MEASURE(compatFlags,drawCompatFlags());
       }
-      drawPatManager();
+      MEASURE(piano,drawPiano());
+      MEASURE(notes,drawNotes());
       if (!basicMode) {
-        drawSysManager();
+        MEASURE(channels,drawChannels());
       }
-      drawClock();
-      drawRegView();
-      drawLog();
-      drawEffectList();
+      MEASURE(patManager,drawPatManager());
+      if (!basicMode) {
+        MEASURE(sysManager,drawSysManager());
+      }
+      MEASURE(clock,drawClock());
+      MEASURE(regView,drawRegView());
+      MEASURE(log,drawLog());
+      MEASURE(effectList,drawEffectList());
     }
 
     activateTutorial(GUI_TUTORIAL_OVERVIEW);
@@ -4960,6 +5024,8 @@ bool FurnaceGUI::loop() {
     }
     if (aboutOpen) drawAbout();
 
+    MEASURE_BEGIN(popup);
+
     if (ImGui::BeginPopupModal("Rendering...",NULL,ImGuiWindowFlags_AlwaysAutoResize)) {
       ImGui::Text("Please wait...");
       if (ImGui::Button("Abort")) {
@@ -5491,12 +5557,16 @@ bool FurnaceGUI::loop() {
       ImGui::EndPopup();
     }
 
+    MEASURE_END(popup);
+
     if (!tutorial.introPlayed || settings.alwaysPlayIntro!=0) {
+      MEASURE_BEGIN(intro);
       initialScreenWipe=0;
       if (settings.alwaysPlayIntro==1) {
         shortIntro=true;
       }
       drawIntro(introPos);
+      MEASURE_END(intro);
     } else {
       introPos=12.0;
     }
@@ -6577,6 +6647,7 @@ FurnaceGUI::FurnaceGUI():
   eventTimeBegin(0),
   eventTimeEnd(0),
   eventTimeDelta(0),
+  perfMetricsLen(0),
   chanToMove(-1),
   sysToMove(-1),
   sysToDelete(-1),
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 75bd3d26..3e3478cc 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -1154,6 +1154,17 @@ struct FurnaceGUIImage {
    ch(0) {}
 };
 
+struct FurnaceGUIPerfMetric {
+  const char* name;
+  int elapsed;
+  FurnaceGUIPerfMetric(const char* n, int t):
+    name(n),
+    elapsed(t) {}
+  FurnaceGUIPerfMetric():
+    name(NULL),
+    elapsed(0) {}
+};
+
 class FurnaceGUI {
   DivEngine* e;
 
@@ -1739,6 +1750,12 @@ class FurnaceGUI {
   int renderTimeBegin, renderTimeEnd, renderTimeDelta;
   int eventTimeBegin, eventTimeEnd, eventTimeDelta;
 
+  FurnaceGUIPerfMetric perfMetrics[64];
+  int perfMetricsLen;
+
+  FurnaceGUIPerfMetric perfMetricsLast[64];
+  int perfMetricsLastLen;
+
   std::map<FurnaceGUIImages,FurnaceGUIImage*> images;
 
   int chanToMove, sysToMove, sysToDelete, opToMove;
diff --git a/src/gui/sysConf.cpp b/src/gui/sysConf.cpp
index 31f66e0a..251ae960 100644
--- a/src/gui/sysConf.cpp
+++ b/src/gui/sysConf.cpp
@@ -1770,6 +1770,21 @@ bool FurnaceGUI::drawSysConf(int chan, DivSystem type, DivConfig& flags, bool mo
       }
       break;
     }
+    case DIV_SYSTEM_SEGAPCM:
+    case DIV_SYSTEM_SEGAPCM_COMPAT: {
+      bool oldSlides=flags.getBool("oldSlides",false);
+
+      if (ImGui::Checkbox("Legacy slides and pitch (compatibility)",&oldSlides)) {
+        altered=true;
+      }
+
+      if (altered) {
+        e->lockSave([&]() {
+          flags.set("oldSlides",oldSlides);
+        });
+      }
+      break;
+    }
     case DIV_SYSTEM_SM8521:/*  {
       bool noAntiClick=flags.getBool("noAntiClick",false);