diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 279eeae57..96058aa5a 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -1461,22 +1461,6 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
     m_enable_cooling_markers = true;
     this->apply_print_config(print.config());
 
-    //BBS: generate simplified_slices if necessary
-    if (m_config.reduce_infill_retraction) {
-        for (auto object : print.objects()) {
-            tbb::parallel_for(
-                tbb::blocked_range<size_t>(0, object->layers().size()),
-                [object](const tbb::blocked_range<size_t>& range) {
-                    for (size_t layer_idx = range.begin(); layer_idx < range.end(); ++ layer_idx) {
-                        Layer* layer = object->layers()[layer_idx];
-                        if (layer)
-                            layer->simplify_reagon_final_slices();
-                    }
-                }
-            );
-        }
-    }
-
     //m_volumetric_speed = DoExport::autospeed_volumetric_limit(print);
     print.throw_if_canceled();
 
diff --git a/src/libslic3r/GCode/RetractWhenCrossingPerimeters.cpp b/src/libslic3r/GCode/RetractWhenCrossingPerimeters.cpp
index 3d3b54d45..776091adf 100644
--- a/src/libslic3r/GCode/RetractWhenCrossingPerimeters.cpp
+++ b/src/libslic3r/GCode/RetractWhenCrossingPerimeters.cpp
@@ -15,7 +15,7 @@ bool RetractWhenCrossingPerimeters::travel_inside_internal_regions(const Layer &
         m_aabbtree_internal_islands.clear();
         // Collect expolygons of internal slices.
         for (const LayerRegion *layerm : layer.regions())
-            for (const Surface &surface : layerm->get_slices_simplified().surfaces)
+            for (const Surface &surface : layerm->get_slices().surfaces)
                 if (surface.is_internal())
                     m_internal_islands.emplace_back(&surface.expolygon);
         // Calculate bounding boxes of internal slices.
diff --git a/src/libslic3r/Layer.hpp b/src/libslic3r/Layer.hpp
index 0db7fc58c..74a7d6291 100644
--- a/src/libslic3r/Layer.hpp
+++ b/src/libslic3r/Layer.hpp
@@ -31,13 +31,10 @@ public:
     const PrintRegion&          region() const  { return *m_region; }
 
     const SurfaceCollection& get_slices() const { return slices; }
-    const SurfaceCollection& get_slices_simplified() const { return slices_simplified; }
 
     // collection of surfaces generated by slicing the original geometry
     // divided by type top/bottom/internal
     SurfaceCollection           slices;
-    //BBS: simplifed final slices data to accelerate
-    SurfaceCollection           slices_simplified;
     // Backed up slices before they are split into top/bottom/internal.
     // Only backed up for multi-region layers or layers with elephant foot compensation.
     //FIXME Review whether not to simplify the code by keeping the raw_slices all the time.
@@ -78,8 +75,6 @@ public:
     void    slices_to_fill_surfaces_clipped();
     void    prepare_fill_surfaces();
     //BBS
-    inline void simplify_final_slices() { this->slices_simplified.set(this->slices); this->slices_simplified.simplify(scaled(SIMPLIFY_SLICES_RESOLUTION));}
-    //BBS
     void    make_perimeters(const SurfaceCollection &slices, SurfaceCollection* fill_surfaces, ExPolygons* fill_no_overlap);
     void    process_external_surfaces(const Layer *lower_layer, const Polygons *lower_layer_covered);
     double  infill_area_threshold() const;
@@ -196,8 +191,6 @@ public:
     void simplify_extrusion_path() { for (auto layerm : m_regions) layerm->simplify_extrusion_entity();}
     //BBS: this function calculate the maximum void grid area of sparse infill of this layer. Just estimated value
     coordf_t get_sparse_infill_max_void_area();
-    //BBS
-    inline void simplify_reagon_final_slices() { for (auto* region : this->m_regions) region->simplify_final_slices();}
 
 protected:
     friend class PrintObject;
diff --git a/src/libslic3r/libslic3r.h b/src/libslic3r/libslic3r.h
index f48218494..8589d705f 100644
--- a/src/libslic3r/libslic3r.h
+++ b/src/libslic3r/libslic3r.h
@@ -76,8 +76,6 @@ static constexpr double BRIDGE_INFILL_MARGIN = 1;
 //inline coord_t scale_(coordf_t v) { return coord_t(floor(v / SCALING_FACTOR + 0.5f)); }
 #define scale_(val) ((val) / SCALING_FACTOR)
 #define unscale_(val) ((val) * SCALING_FACTOR)
-//BBS
-static constexpr double SIMPLIFY_SLICES_RESOLUTION = 0.1;
 
 //BBS: BBS only support relative E and can't been changed by user at the moment. because
 //BBS need to support skip object when printing.