diff --git a/src/slic3r/GUI/CalibrationBedDialog.cpp b/src/slic3r/GUI/CalibrationBedDialog.cpp
index 9d3a2efe8..cd82d354c 100644
--- a/src/slic3r/GUI/CalibrationBedDialog.cpp
+++ b/src/slic3r/GUI/CalibrationBedDialog.cpp
@@ -121,6 +121,8 @@ void CalibrationBedDialog::create_geometry(wxCommandEvent& event_args) {
         model.objects[objs_idx[i]]->config.set_key_value("gap_fill", new ConfigOptionBool(false));
         model.objects[objs_idx[i]]->config.set_key_value("first_layer_extrusion_width", new ConfigOptionFloatOrPercent(140, true));
         model.objects[objs_idx[i]]->config.set_key_value("bottom_fill_pattern", new ConfigOptionEnum<InfillPattern>(ipRectilinearWGapFill));
+        //disable ironing post-process
+        model.objects[objs_idx[i]]->config.set_key_value("ironing", new ConfigOptionBool(false));
     }
     if (bed_shape->values.size() == 4) {
         model.objects[objs_idx[0]]->config.set_key_value("fill_angle", new ConfigOptionFloat(90));
diff --git a/src/slic3r/GUI/CalibrationBridgeDialog.cpp b/src/slic3r/GUI/CalibrationBridgeDialog.cpp
index ba49b5099..5ea622180 100644
--- a/src/slic3r/GUI/CalibrationBridgeDialog.cpp
+++ b/src/slic3r/GUI/CalibrationBridgeDialog.cpp
@@ -141,7 +141,8 @@ void CalibrationBridgeDialog::create_geometry(std::string setting_to_test, bool
         model.objects[objs_idx[i]]->config.set_key_value(setting_to_test, new ConfigOptionPercent(start + (add ? 1 : -1) * i * step));
         model.objects[objs_idx[i]]->config.set_key_value("layer_height", new ConfigOptionFloat(nozzle_diameter / 2));
         model.objects[objs_idx[i]]->config.set_key_value("no_perimeter_unsupported_algo", new ConfigOptionEnum<NoPerimeterUnsupportedAlgo>(npuaBridges));
-        model.objects[objs_idx[i]]->config.set_key_value("top_fill_pattern", new ConfigOptionEnum<InfillPattern>(ipSmooth));
+        //model.objects[objs_idx[i]]->config.set_key_value("top_fill_pattern", new ConfigOptionEnum<InfillPattern>(ipSmooth)); /not needed
+        model.objects[objs_idx[i]]->config.set_key_value("ironing", new ConfigOptionBool(false)); // not needed, and it slow down things.
     }
     /// if first ayer height is excatly at the wrong value, the text isn't drawed. Fix that by switching the first layer height just a little bit.
     double first_layer_height = print_config->get_computed_value("first_layer_height", 0);
diff --git a/src/slic3r/GUI/CalibrationFlowDialog.cpp b/src/slic3r/GUI/CalibrationFlowDialog.cpp
index 74858ac0d..3999457f9 100644
--- a/src/slic3r/GUI/CalibrationFlowDialog.cpp
+++ b/src/slic3r/GUI/CalibrationFlowDialog.cpp
@@ -156,6 +156,8 @@ void CalibrationFlowDialog::create_geometry(float start, float delta) {
         model.objects[objs_idx[i]]->config.set_key_value("external_infill_margin", new ConfigOptionFloatOrPercent(100, true));
         model.objects[objs_idx[i]]->config.set_key_value("solid_fill_pattern", new ConfigOptionEnum<InfillPattern>(ipRectilinearWGapFill));
         model.objects[objs_idx[i]]->config.set_key_value("top_fill_pattern", new ConfigOptionEnum<InfillPattern>(ipSmooth));
+        //disable ironing post-process
+        model.objects[objs_idx[i]]->config.set_key_value("ironing", new ConfigOptionBool(false));
         //set extrusion mult: 80 90 100 110 120
         model.objects[objs_idx[i]]->config.set_key_value("print_extrusion_multiplier", new ConfigOptionPercent(start + (float)i * delta));
     }
diff --git a/src/slic3r/GUI/CalibrationOverBridgeDialog.cpp b/src/slic3r/GUI/CalibrationOverBridgeDialog.cpp
index e0a12e612..68ece7d45 100644
--- a/src/slic3r/GUI/CalibrationOverBridgeDialog.cpp
+++ b/src/slic3r/GUI/CalibrationOverBridgeDialog.cpp
@@ -125,6 +125,7 @@ void CalibrationOverBridgeDialog::create_geometry(bool over_bridge) {
         model.objects[objs_idx[i]]->config.set_key_value("fill_density", new ConfigOptionPercent(5.5));
         model.objects[objs_idx[i]]->config.set_key_value("fill_pattern", new ConfigOptionEnum<InfillPattern>(ipRectilinear));
         model.objects[objs_idx[i]]->config.set_key_value("infill_dense", new ConfigOptionBool(false));
+        model.objects[objs_idx[i]]->config.set_key_value("ironing", new ConfigOptionBool(false));
         //calibration setting. Use 100 & 5 step as it's the numbers printed on the samples
         if(over_bridge)
             model.objects[objs_idx[i]]->config.set_key_value("over_bridge_flow_ratio", new ConfigOptionPercent(/*print_config->option<ConfigOptionPercent>("over_bridge_flow_ratio")->get_abs_value(100)*/100 + i * 5));
diff --git a/src/slic3r/GUI/CalibrationTempDialog.cpp b/src/slic3r/GUI/CalibrationTempDialog.cpp
index 42b38f02e..3789fb104 100644
--- a/src/slic3r/GUI/CalibrationTempDialog.cpp
+++ b/src/slic3r/GUI/CalibrationTempDialog.cpp
@@ -165,6 +165,8 @@ void CalibrationTempDialog::create_geometry(wxCommandEvent& event_args) {
     model.objects[objs_idx[0]]->config.set_key_value("fill_density", new ConfigOptionPercent(7));
     model.objects[objs_idx[0]]->config.set_key_value("solid_fill_pattern", new ConfigOptionEnum<InfillPattern>(ipRectilinearWGapFill));
     model.objects[objs_idx[0]]->config.set_key_value("top_fill_pattern", new ConfigOptionEnum<InfillPattern>(ipRectilinearWGapFill));
+    //disable ironing post-process, it only slow down things
+    model.objects[objs_idx[0]]->config.set_key_value("ironing", new ConfigOptionBool(false));
 
     //update plater
     GLCanvas3D::set_warning_freeze(false);