diff --git a/etc/DependencyInstaller.sh b/etc/DependencyInstaller.sh
index 42fd1bbb077..81218d9cd9e 100755
--- a/etc/DependencyInstaller.sh
+++ b/etc/DependencyInstaller.sh
@@ -66,9 +66,9 @@ _installCommonDev() {
     pcreChecksum="37d2f77cfd411a3ddf1c64e1d72e43f7"
     swigVersion=4.1.0
     swigChecksum="794433378154eb61270a3ac127d9c5f3"
-    boostVersionBig=1.80
+    boostVersionBig=1.86
     boostVersionSmall=${boostVersionBig}.0
-    boostChecksum="077f074743ea7b0cb49c6ed43953ae95"
+    boostChecksum="ac857d73bb754b718a039830b07b9624"
     eigenVersion=3.4
     cuddVersion=3.0.0
     lemonVersion=1.3.1
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index cf33b31a136..bcea61b9901 100755
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -172,8 +172,11 @@ if (SWIG_VERSION VERSION_GREATER_EQUAL "4.1.0")
 endif()
 include(UseSWIG)
 
-find_package(Boost REQUIRED)
+find_package(Boost 1.81.0)
 message(STATUS "boost: ${Boost_VERSION}")
+if(NOT Boost_FOUND)
+  message(FATAL_ERROR "No suitable version of boost found. Consider (re)running `<OpenROAD-dir>/etc/DependencyInstaller.sh -common`")
+endif()
 
 if (ENABLE_TESTS)
   find_package(GTest REQUIRED)
diff --git a/src/drt/src/db/infra/frPoint.h b/src/drt/src/db/infra/frPoint.h
index 6443eae96b3..5b8ed13ee14 100644
--- a/src/drt/src/db/infra/frPoint.h
+++ b/src/drt/src/db/infra/frPoint.h
@@ -65,6 +65,14 @@ class Point3D : public Point
     return z_ < rhs.z_;
   }
 
+  friend std::size_t hash_value(Point3D const& p)
+  {
+    std::size_t seed = 0;
+    boost::hash_combine(seed, hash_value(((Point) p)));
+    boost::hash_combine(seed, p.getZ());
+    return seed;
+  }
+
  private:
   int z_{0};
   template <class Archive>
diff --git a/src/drt/src/gc/FlexGC_impl.h b/src/drt/src/gc/FlexGC_impl.h
index 973f1cd48f8..042ed5503d0 100644
--- a/src/drt/src/gc/FlexGC_impl.h
+++ b/src/drt/src/gc/FlexGC_impl.h
@@ -28,6 +28,7 @@
 
 #pragma once
 
+#include <boost/unordered/unordered_flat_set.hpp>
 #include <memory>
 
 #include "db/gcObj/gcNet.h"
@@ -191,31 +192,36 @@ class FlexGCWorker::Impl
   void initNet_pins_polygonEdges(gcNet* net);
   void initNet_pins_polygonEdges_getFixedPolygonEdges(
       gcNet* net,
-      std::vector<std::set<std::pair<Point, Point>>>& fixedPolygonEdges);
+      std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>&
+          fixedPolygonEdges);
   void initNet_pins_polygonEdges_helper_outer(
       gcNet* net,
       gcPin* pin,
       gcPolygon* poly,
       frLayerNum i,
-      const std::vector<std::set<std::pair<Point, Point>>>& fixedPolygonEdges);
+      const std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>&
+          fixedPolygonEdges);
   void initNet_pins_polygonEdges_helper_inner(
       gcNet* net,
       gcPin* pin,
       const gtl::polygon_90_data<frCoord>& hole_poly,
       frLayerNum i,
-      const std::vector<std::set<std::pair<Point, Point>>>& fixedPolygonEdges);
+      const std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>&
+          fixedPolygonEdges);
   void initNet_pins_polygonCorners(gcNet* net);
   void initNet_pins_polygonCorners_helper(gcNet* net, gcPin* pin);
   void initNet_pins_maxRectangles(gcNet* net);
   void initNet_pins_maxRectangles_getFixedMaxRectangles(
       gcNet* net,
-      std::vector<std::set<std::pair<Point, Point>>>& fixedMaxRectangles);
+      std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>&
+          fixedMaxRectangles);
   void initNet_pins_maxRectangles_helper(
       gcNet* net,
       gcPin* pin,
       const gtl::rectangle_data<frCoord>& rect,
       frLayerNum i,
-      const std::vector<std::set<std::pair<Point, Point>>>& fixedMaxRectangles);
+      const std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>&
+          fixedMaxRectangles);
 
   void initRegionQuery();
 
diff --git a/src/drt/src/gc/FlexGC_init.cpp b/src/drt/src/gc/FlexGC_init.cpp
index 4575e6a5962..904277fb3c8 100644
--- a/src/drt/src/gc/FlexGC_init.cpp
+++ b/src/drt/src/gc/FlexGC_init.cpp
@@ -486,7 +486,8 @@ void FlexGCWorker::Impl::initNet_pins_polygon(gcNet* net)
 
 void FlexGCWorker::Impl::initNet_pins_polygonEdges_getFixedPolygonEdges(
     gcNet* net,
-    std::vector<std::set<std::pair<Point, Point>>>& fixedPolygonEdges)
+    std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>&
+        fixedPolygonEdges)
 {
   int numLayers = getTech()->getLayers().size();
   std::vector<gtl::polygon_90_with_holes_data<frCoord>> polys;
@@ -552,7 +553,8 @@ void FlexGCWorker::Impl::initNet_pins_polygonEdges_helper_outer(
     gcPin* pin,
     gcPolygon* poly,
     frLayerNum i,
-    const std::vector<std::set<std::pair<Point, Point>>>& fixedPolygonEdges)
+    const std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>&
+        fixedPolygonEdges)
 {
   Point bp, ep, firstPt;
   gtl::point_data<frCoord> bp1, ep1, firstPt1;
@@ -626,7 +628,8 @@ void FlexGCWorker::Impl::initNet_pins_polygonEdges_helper_inner(
     gcPin* pin,
     const gtl::polygon_90_data<frCoord>& hole_poly,
     frLayerNum i,
-    const std::vector<std::set<std::pair<Point, Point>>>& fixedPolygonEdges)
+    const std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>&
+        fixedPolygonEdges)
 {
   Point bp, ep, firstPt;
   gtl::point_data<frCoord> bp1, ep1, firstPt1;
@@ -698,7 +701,8 @@ void FlexGCWorker::Impl::initNet_pins_polygonEdges_helper_inner(
 void FlexGCWorker::Impl::initNet_pins_polygonEdges(gcNet* net)
 {
   int numLayers = getTech()->getLayers().size();
-  std::vector<std::set<std::pair<Point, Point>>> fixedPolygonEdges(numLayers);
+  std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>
+      fixedPolygonEdges(numLayers);
   // get all fixed polygon edges
   initNet_pins_polygonEdges_getFixedPolygonEdges(net, fixedPolygonEdges);
 
@@ -852,7 +856,8 @@ void FlexGCWorker::Impl::initNet_pins_polygonCorners(gcNet* net)
 
 void FlexGCWorker::Impl::initNet_pins_maxRectangles_getFixedMaxRectangles(
     gcNet* net,
-    std::vector<std::set<std::pair<Point, Point>>>& fixedMaxRectangles)
+    std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>&
+        fixedMaxRectangles)
 {
   int numLayers = getTech()->getLayers().size();
   std::vector<gtl::rectangle_data<frCoord>> rects;
@@ -878,7 +883,8 @@ void FlexGCWorker::Impl::initNet_pins_maxRectangles_helper(
     gcPin* pin,
     const gtl::rectangle_data<frCoord>& rect,
     frLayerNum i,
-    const std::vector<std::set<std::pair<Point, Point>>>& fixedMaxRectangles)
+    const std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>&
+        fixedMaxRectangles)
 {
   auto rectangle = std::make_unique<gcRect>();
   rectangle->setRect(rect);
@@ -916,7 +922,8 @@ void FlexGCWorker::Impl::initNet_pins_maxRectangles_helper(
 void FlexGCWorker::Impl::initNet_pins_maxRectangles(gcNet* net)
 {
   int numLayers = getTech()->getLayers().size();
-  std::vector<std::set<std::pair<Point, Point>>> fixedMaxRectangles(numLayers);
+  std::vector<boost::unordered_flat_set<std::pair<Point, Point>>>
+      fixedMaxRectangles(numLayers);
   // get all fixed max rectangles
   initNet_pins_maxRectangles_getFixedMaxRectangles(net, fixedMaxRectangles);
 
diff --git a/src/drt/src/io/GuideProcessor.cpp b/src/drt/src/io/GuideProcessor.cpp
index a85ab2d1ff4..10ab0eb768a 100644
--- a/src/drt/src/io/GuideProcessor.cpp
+++ b/src/drt/src/io/GuideProcessor.cpp
@@ -1159,7 +1159,7 @@ void addSplitRect(const frCoord track_idx,
 void GuideProcessor::genGuides_split(
     std::vector<frRect>& rects,
     const TrackIntervalsByLayer& intvs,
-    const std::map<Point3D, frBlockObjectSet>& gcell_pin_map,
+    const boost::unordered_flat_map<Point3D, frBlockObjectSet>& gcell_pin_map,
     frBlockObjectMap<std::set<Point3D>>& pin_gcell_map,
     bool via_access_only) const
 {
@@ -1262,7 +1262,7 @@ void GuideProcessor::genGuides_split(
 }
 
 void GuideProcessor::mapPinShapesToGCells(
-    std::map<Point3D, frBlockObjectSet>& gcell_pin_map,
+    boost::unordered_flat_map<Point3D, frBlockObjectSet>& gcell_pin_map,
     frBlockObject* term) const
 {
   const auto pin_shapes = getPinShapes(term);
@@ -1283,7 +1283,7 @@ void GuideProcessor::mapPinShapesToGCells(
 
 void GuideProcessor::initGCellPinMap(
     const frNet* net,
-    std::map<Point3D, frBlockObjectSet>& gcell_pin_map) const
+    boost::unordered_flat_map<Point3D, frBlockObjectSet>& gcell_pin_map) const
 {
   for (auto instTerm : net->getInstTerms()) {
     mapTermAccessPointsToGCells(gcell_pin_map, instTerm);
@@ -1294,7 +1294,7 @@ void GuideProcessor::initGCellPinMap(
 }
 
 void GuideProcessor::mapTermAccessPointsToGCells(
-    std::map<Point3D, frBlockObjectSet>& gcell_pin_map,
+    boost::unordered_flat_map<Point3D, frBlockObjectSet>& gcell_pin_map,
     frBlockObject* pin) const
 {
   for (const auto& ap_loc : getAccessPoints(pin)) {
@@ -1376,7 +1376,7 @@ std::vector<std::pair<frBlockObject*, Point>> GuideProcessor::genGuides(
   }
   genGuides_prep(rects, intvs);
 
-  std::map<Point3D, frBlockObjectSet> gcell_pin_map;
+  boost::unordered_flat_map<Point3D, frBlockObjectSet> gcell_pin_map;
   frBlockObjectMap<std::set<Point3D>> pin_gcell_map;
   initGCellPinMap(net, gcell_pin_map);
   initPinGCellMap(net, pin_gcell_map);
@@ -2024,4 +2024,4 @@ void GuideProcessor::processGuides()
   }
 }
 
-}  // namespace drt::io
\ No newline at end of file
+}  // namespace drt::io
diff --git a/src/drt/src/io/GuideProcessor.h b/src/drt/src/io/GuideProcessor.h
index bfd2a175005..5f1cc235496 100644
--- a/src/drt/src/io/GuideProcessor.h
+++ b/src/drt/src/io/GuideProcessor.h
@@ -32,6 +32,7 @@
 ///////////////////////////////////////////////////////////////////////////////
 #pragma once
 #include <boost/icl/interval_set.hpp>
+#include <boost/unordered/unordered_flat_map.hpp>
 
 #include "db/tech/frTechObject.h"
 #include "frDesign.h"
@@ -175,11 +176,12 @@ class GuideProcessor
    * guides only.
    *
    */
-  void genGuides_split(std::vector<frRect>& rects,
-                       const TrackIntervalsByLayer& intvs,
-                       const std::map<Point3D, frBlockObjectSet>& gcell_pin_map,
-                       frBlockObjectMap<std::set<Point3D>>& pin_gcell_map,
-                       bool via_access_only) const;
+  void genGuides_split(
+      std::vector<frRect>& rects,
+      const TrackIntervalsByLayer& intvs,
+      const boost::unordered_flat_map<Point3D, frBlockObjectSet>& gcell_pin_map,
+      frBlockObjectMap<std::set<Point3D>>& pin_gcell_map,
+      bool via_access_only) const;
   /**
    * Initializes a map of gcell location to set of pins
    *
@@ -190,9 +192,9 @@ class GuideProcessor
    * considered by this function.
    * @param gcell_pin_map A map to be populated by the result of this function.
    */
-  void initGCellPinMap(
-      const frNet* net,
-      std::map<Point3D, frBlockObjectSet>& gcell_pin_map) const;
+  void initGCellPinMap(const frNet* net,
+                       boost::unordered_flat_map<Point3D, frBlockObjectSet>&
+                           gcell_pin_map) const;
   /**
    * Populates gcell_pin_map with the values associated with the passed term
    * based on pin shapes.
@@ -204,8 +206,9 @@ class GuideProcessor
    * @param gcell_pin_map The map to be populated with the results.
    * @param term The current pin we are processing.
    */
-  void mapPinShapesToGCells(std::map<Point3D, frBlockObjectSet>& gcell_pin_map,
-                            frBlockObject* term) const;
+  void mapPinShapesToGCells(
+      boost::unordered_flat_map<Point3D, frBlockObjectSet>& gcell_pin_map,
+      frBlockObject* term) const;
   /**
    * Populates gcell_pin_map with the values associated with the passed pin
    * based on access points.
@@ -218,7 +221,7 @@ class GuideProcessor
    * @param term The current pin we are processing.
    */
   void mapTermAccessPointsToGCells(
-      std::map<Point3D, frBlockObjectSet>& gcell_pin_map,
+      boost::unordered_flat_map<Point3D, frBlockObjectSet>& gcell_pin_map,
       frBlockObject* pin) const;
 
   void initPinGCellMap(frNet* net,
@@ -441,4 +444,4 @@ class GuidePathFinder
   frBlockObjectMap<std::set<Point3D>> pin_gcell_map_;
   std::vector<frRect> rects_;
 };
-}  // namespace drt::io
\ No newline at end of file
+}  // namespace drt::io
diff --git a/src/drt/src/pa/FlexPA_unique.h b/src/drt/src/pa/FlexPA_unique.h
index ef1d0265e1b..56b7beb016d 100644
--- a/src/drt/src/pa/FlexPA_unique.h
+++ b/src/drt/src/pa/FlexPA_unique.h
@@ -27,6 +27,8 @@
 
 #pragma once
 
+#include <boost/unordered/unordered_flat_map.hpp>
+
 #include "frDesign.h"
 
 namespace drt {
@@ -158,7 +160,7 @@ class UniqueInsts
   // Mapp all instances to their representative unique instance
   std::map<frInst*, frInst*, frBlockObjectComp> inst_to_unique_;
   // Maps all instances to the set of instances with the same unique inst
-  std::unordered_map<frInst*, InstSet*> inst_to_class_;
+  boost::unordered_flat_map<frInst*, InstSet*> inst_to_class_;
   // Maps a unique instance to its pin access index
   std::map<frInst*, int, frBlockObjectComp> unique_to_pa_idx_;
   // Maps a unique instance to its index in unique_
diff --git a/src/odb/include/odb/geom.h b/src/odb/include/odb/geom.h
index 7cff0a8da4c..1d98032950d 100644
--- a/src/odb/include/odb/geom.h
+++ b/src/odb/include/odb/geom.h
@@ -33,6 +33,7 @@
 #pragma once
 
 #include <algorithm>
+#include <boost/functional/hash.hpp>
 #include <iosfwd>
 #include <tuple>
 #include <vector>
@@ -90,6 +91,20 @@ class Point
   int y_ = 0;
 };
 
+inline std::size_t hash_value(Point const& p)
+{
+  size_t hash = 0;
+  if constexpr (sizeof(size_t) == 8 && sizeof(size_t) == 2 * sizeof(int)) {
+    // Use fast identity hash if possible. We don't care about avalanching since
+    // it will be mixed later by flat_map anyway
+    return ((size_t) p.getX() << 32) | p.getY();
+  } else {
+    boost::hash_combine(hash, p.x());
+    boost::hash_combine(hash, p.y());
+  }
+  return hash;
+}
+
 std::ostream& operator<<(std::ostream& os, const Point& pIn);
 
 /*