diff --git a/src/slic3r/GUI/DoubleSliderForLayers.cpp b/src/slic3r/GUI/DoubleSliderForLayers.cpp
index fb7deef9ce..42e6ae85f1 100644
--- a/src/slic3r/GUI/DoubleSliderForLayers.cpp
+++ b/src/slic3r/GUI/DoubleSliderForLayers.cpp
@@ -20,7 +20,6 @@
 #include "I18N.hpp"
 #include "ImGuiWrapper.hpp"
 #include "libslic3r/libslic3r.h"
-#include "slic3r/GUI/GUI.hpp"      // GUI::shortkey_ctrl_prefix()
 #include "slic3r/GUI/ImGuiDoubleSlider.hpp"
 #include "slic3r/GUI/ImGuiPureWrap.hpp"
 #include "slic3r/GUI/RulerForDoubleSlider.hpp"
@@ -1146,8 +1145,7 @@ std::string DSForLayers::get_tooltip(int tick/*=-1*/)
                   _u8L("Add color change - Left click")  ) + " " +
                   _u8L("or press \"+\" key") + "\n" + (
                      is_osx ? 
-                  // TRN %1% is shortkey Ctrl prefix in respect to the OS
-                  format(_u8L("Add another code - %1% Left click"), Slic3r::GUI::shortkey_ctrl_prefix()) :
+                  _u8L("Add another code - Ctrl + Left click") :
                   _u8L("Add another code - Right click") );
     }
 
@@ -1212,8 +1210,7 @@ std::string DSForLayers::get_tooltip(int tick/*=-1*/)
         if (m_focus == fiActionIcon)
         tooltip += "\n\n" + _u8L("Delete tick mark - Left click or press \"-\" key") + "\n" + (
                       is_osx ? 
-                   // TRN %1% is shortkey Ctrl prefix in respect to the OS
-                   format(_u8L("Edit tick mark - %1% Left click"), Slic3r::GUI::shortkey_ctrl_prefix()) :
+                   _u8L("Edit tick mark - Ctrl + Left click") :
                    _u8L("Edit tick mark - Right click") );
     }
 
diff --git a/src/slic3r/GUI/ImGuiDoubleSlider.cpp b/src/slic3r/GUI/ImGuiDoubleSlider.cpp
index 7ad9dcd368..50201cad2f 100644
--- a/src/slic3r/GUI/ImGuiDoubleSlider.cpp
+++ b/src/slic3r/GUI/ImGuiDoubleSlider.cpp
@@ -49,8 +49,15 @@ static bool behavior(ImGuiID id, const ImRect& region,
     if (ImGui::ItemHoverable(mouse_wheel_responsive_region, id)) {
         if (change_on_mouse_move)
             v_new = v_min + (ImS32)(v_range * mouse_pos_ratio + 0.5f);
-        else 
-            v_new = ImClamp(*out_value + (ImS32)(context.IO.MouseWheel/* * accer*/), v_min, v_max);
+        else {
+            float mw = context.IO.MouseWheel;
+#if defined(__APPLE__)
+            if (mw > 0.f) mw = 1.f;
+            if (mw < 0.f) mw = -1.f;
+#endif
+            const float accer = context.IO.KeyCtrl || context.IO.KeyShift ? 5.f : 1.f;
+            v_new = ImClamp(*out_value + (ImS32)(mw * accer), v_min, v_max);
+        }
     }
 
     // drag behavior