diff --git a/.gitmodules b/.gitmodules
index 51dd0792..51193203 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -26,3 +26,6 @@
 [submodule "extlib/q3d"]
 	path = extlib/q3d
 	url = https://github.com/q3k/q3d
+[submodule "extlib/mimalloc"]
+	path = extlib/mimalloc
+	url = https://github.com/microsoft/mimalloc
diff --git a/.travis/install-debian.sh b/.travis/install-debian.sh
index c8b7d70b..fb20fffa 100755
--- a/.travis/install-debian.sh
+++ b/.travis/install-debian.sh
@@ -7,4 +7,4 @@ sudo apt-get install -q -y \
   libfontconfig1-dev libgtkmm-3.0-dev libpangomm-1.4-dev libgl-dev \
   libgl-dev libglu-dev libspnav-dev 
 
-git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3d
+git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3d extlib/mimalloc
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5a258f4b..c4914d63 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -175,6 +175,14 @@ message(STATUS "Using in-tree q3d")
 add_subdirectory(extlib/q3d)
 set(Q3D_INCLUDE_DIR ${CMAKE_BINARY_DIR}/extlib/q3d)
 
+message(STATUS "Using in-tree mimalloc")
+set(MI_OVERRIDE OFF CACHE BOOL "")
+set(MI_BUILD_SHARED OFF CACHE BOOL "")
+set(MI_BUILD_OBJECT OFF CACHE BOOL "")
+set(MI_BUILD_TESTS OFF CACHE BOOL "")
+add_subdirectory(extlib/mimalloc)
+set(MIMALLOC_INCLUDE_DIR ${CMAKE_SOURCE_DIR}/extlib/mimalloc/include)
+
 if(WIN32 OR APPLE)
     # On Win32 and macOS we use vendored packages, since there is little to no benefit
     # to trying to find system versions. In particular, trying to link to libraries from
diff --git a/README.md b/README.md
index cd72564d..295f25fe 100644
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@ Before building, check out the project and the necessary submodules:
 
     git clone https://github.com/solvespace/solvespace
     cd solvespace
-    git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3d
+    git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3d extlib/mimalloc
 
 After that, build SolveSpace as following:
 
@@ -185,7 +185,7 @@ Before building, check out the project and the necessary submodules:
 
     git clone https://github.com/solvespace/solvespace
     cd solvespace
-    git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3d
+    git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3d extlib/mimalloc
 
 After that, build SolveSpace as following:
 
diff --git a/extlib/mimalloc b/extlib/mimalloc
new file mode 160000
index 00000000..07c6e60a
--- /dev/null
+++ b/extlib/mimalloc
@@ -0,0 +1 @@
+Subproject commit 07c6e60a5a3bd7de09e4a170cd97bafba59cfafd
diff --git a/pkg/snap/snap/snapcraft.yaml b/pkg/snap/snap/snapcraft.yaml
index 273f9d49..195a5086 100644
--- a/pkg/snap/snap/snapcraft.yaml
+++ b/pkg/snap/snap/snapcraft.yaml
@@ -45,7 +45,7 @@ parts:
       snapcraftctl set-version "$version"
       git describe --exact-match HEAD && grade="stable" || grade="devel"
       snapcraftctl set-grade "$grade"
-      git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3d
+      git submodule update --init extlib/libdxfrw extlib/flatbuffers extlib/q3d extlib/mimalloc
     configflags:
       - -DCMAKE_INSTALL_PREFIX=/usr
       - -DCMAKE_BUILD_TYPE=Release
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index d1d9fc35..16d6e360 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -59,7 +59,11 @@ target_include_directories(slvs
     PUBLIC ${CMAKE_SOURCE_DIR}/include)
 
 target_link_libraries(slvs
-    ${util_LIBRARIES})
+    ${util_LIBRARIES}
+    mimalloc-static)
+
+add_dependencies(slvs
+    mimalloc-static)
 
 set_target_properties(slvs PROPERTIES
     PUBLIC_HEADER ${CMAKE_SOURCE_DIR}/include/slvs.h
@@ -81,7 +85,8 @@ include_directories(
     ${PNG_PNG_INCLUDE_DIR}
     ${FREETYPE_INCLUDE_DIRS}
     ${CAIRO_INCLUDE_DIRS}
-    ${Q3D_INCLUDE_DIR})
+    ${Q3D_INCLUDE_DIR}
+    ${MIMALLOC_INCLUDE_DIR})
 
 if(Backtrace_FOUND)
     include_directories(
@@ -213,7 +218,8 @@ add_library(solvespace-core STATIC
     ${solvespace_core_SOURCES})
 
 add_dependencies(solvespace-core
-    q3d_header)
+    q3d_header
+    mimalloc-static)
 
 target_link_libraries(solvespace-core
     ${OpenMP_CXX_LIBRARIES}
@@ -222,7 +228,8 @@ target_link_libraries(solvespace-core
     ${ZLIB_LIBRARY}
     ${PNG_LIBRARY}
     ${FREETYPE_LIBRARY}
-    flatbuffers)
+    flatbuffers
+    mimalloc-static)
 
 if(Backtrace_FOUND)
     target_link_libraries(solvespace-core