diff --git a/src/gui/gui.cpp b/src/gui/gui.cpp
index e8b769a47..fd5d5a7d2 100644
--- a/src/gui/gui.cpp
+++ b/src/gui/gui.cpp
@@ -59,13 +59,13 @@ extern "C" {
 #define LAYOUT_INI "/layout.ini"
 #endif
 
-bool Particle::update() {
-  pos.x+=speed.x;
-  pos.y+=speed.y;
-  speed.x*=friction;
-  speed.y*=friction;
-  speed.y+=gravity;
-  life-=lifeSpeed;
+bool Particle::update(float frameTime) {
+  pos.x+=speed.x*frameTime;
+  pos.y+=speed.y*frameTime;
+  speed.x*=1.0-((1.0-friction)*frameTime);
+  speed.y*=1.0-((1.0-friction)*frameTime);
+  speed.y+=gravity*frameTime;
+  life-=lifeSpeed*frameTime;
   return (life>0);
 }
 
@@ -1437,10 +1437,11 @@ void FurnaceGUI::drawVolMeter() {
     ImGuiStyle& style=ImGui::GetStyle();
     ImGui::ItemSize(ImVec2(4.0f,4.0f),style.FramePadding.y);
     ImU32 lowColor=ImGui::GetColorU32(uiColors[GUI_COLOR_VOLMETER_LOW]);
+    float peakDecay=0.05f*60.0f*ImGui::GetIO().DeltaTime;
     if (ImGui::ItemAdd(rect,ImGui::GetID("volMeter"))) {
       ImGui::RenderFrame(rect.Min,rect.Max,ImGui::GetColorU32(ImGuiCol_FrameBg),true,style.FrameRounding);
       for (int i=0; i<2; i++) {
-        peak[i]*=0.95;
+        peak[i]*=1.0-peakDecay;
         if (peak[i]<0.0001) peak[i]=0.0;
         for (int j=0; j<e->oscSize; j++) {
           if (fabs(e->oscBuf[i][j])>peak[i]) {
diff --git a/src/gui/gui.h b/src/gui/gui.h
index 8db639ab5..495073a21 100644
--- a/src/gui/gui.h
+++ b/src/gui/gui.h
@@ -391,7 +391,7 @@ struct Particle {
   const char* type;
   ImVec2 pos, speed;
   float gravity, friction, life, lifeSpeed;
-  bool update();
+  bool update(float frameTime);
   Particle(ImU32* color, const char* ty, float x, float y, float sX, float sY, float g, float fr, float l, float lS):
     colors(color),
     type(ty),
diff --git a/src/gui/pattern.cpp b/src/gui/pattern.cpp
index c6c78ba8d..7d9eb43ce 100644
--- a/src/gui/pattern.cpp
+++ b/src/gui/pattern.cpp
@@ -451,7 +451,7 @@ void FurnaceGUI::drawPattern() {
         chanHead.x*=0.25+keyHit[i]; chanHead.y*=0.25+keyHit[i]; chanHead.z*=0.25+keyHit[i];
         chanHeadActive.x*=0.8; chanHeadActive.y*=0.8; chanHeadActive.z*=0.8;
         chanHeadHover.x*=0.4+keyHit[i]; chanHeadHover.y*=0.4+keyHit[i]; chanHeadHover.z*=0.4+keyHit[i];
-        keyHit[i]-=0.02;
+        keyHit[i]-=0.02*60.0*ImGui::GetIO().DeltaTime;
         if (keyHit[i]<0) keyHit[i]=0;
         ImGui::PushStyleColor(ImGuiCol_Header,chanHead);
         ImGui::PushStyleColor(ImGuiCol_HeaderActive,chanHeadActive);
@@ -717,6 +717,8 @@ void FurnaceGUI::drawPattern() {
         }
       }
 
+      float frameTime=ImGui::GetIO().DeltaTime*60.0f;
+
       // note slides
       ImVec2 arrowPoints[7];
       if (e->isPlaying()) for (int i=0; i<chans; i++) {
@@ -763,7 +765,7 @@ void FurnaceGUI::drawPattern() {
               dl->AddPolyline(arrowPoints,7,ImGui::GetColorU32(col),ImDrawFlags_None,5.0f*dpiScale);
             }
           }
-          patChanSlideY[i]+=((ch->portaNote<=ch->note)?-8:8)*dpiScale;
+          patChanSlideY[i]+=((ch->portaNote<=ch->note)?-8:8)*dpiScale*frameTime;
           if (width>0) {
             if (patChanSlideY[i]<0) {
               patChanSlideY[i]=-fmod(-patChanSlideY[i],width*0.7);
@@ -778,7 +780,7 @@ void FurnaceGUI::drawPattern() {
       ImDrawList* fdl=ImGui::GetForegroundDrawList();
       for (size_t i=0; i<particles.size(); i++) {
         Particle& part=particles[i];
-        if (part.update()) {
+        if (part.update(frameTime)) {
           if (part.life>255) part.life=255;
           fdl->AddText(
             iconFont,