diff --git a/libsrc/csg/python_csg.cpp b/libsrc/csg/python_csg.cpp
index a53c8590..6376abd4 100644
--- a/libsrc/csg/python_csg.cpp
+++ b/libsrc/csg/python_csg.cpp
@@ -756,10 +756,8 @@ However, when r = 0, the top part becomes a point(tip) and meshing fails!
            {
              MeshingParameters mp;
              if(pars) mp = *pars;
-             {
-               py::gil_scoped_acquire aq;
-               CreateMPfromKwargs(mp, kwargs);
-             }
+             CreateMPfromKwargs(mp, kwargs);
+             py::gil_scoped_release gil_rel;
              auto mesh = make_shared<Mesh>();
              SetGlobalMesh (mesh);
              mesh->SetGeometry(geo);
@@ -770,8 +768,7 @@ However, when r = 0, the top part becomes a point(tip) and meshing fails!
                throw Exception("Meshing failed!");
              return mesh;
            }, py::arg("mp") = nullptr,
-       meshingparameter_description.c_str(),
-    py::call_guard<py::gil_scoped_release>())
+       meshingparameter_description.c_str())
     ;
 
   m.def("Save", FunctionPointer 
diff --git a/libsrc/geom2d/python_geom2d.cpp b/libsrc/geom2d/python_geom2d.cpp
index ab232f13..dc6ae29c 100644
--- a/libsrc/geom2d/python_geom2d.cpp
+++ b/libsrc/geom2d/python_geom2d.cpp
@@ -401,10 +401,8 @@ NGCORE_API_EXPORT void ExportGeom2d(py::module &m)
 		{
                   MeshingParameters mp;
                   if(pars) mp = *pars;
-                  {
-                    py::gil_scoped_acquire aq;
-                    CreateMPfromKwargs(mp, kwargs);
-                  }
+                  CreateMPfromKwargs(mp, kwargs);
+                  py::gil_scoped_release gil_release;
 		  auto mesh = make_shared<Mesh>();
                   mesh->SetGeometry(self);
                   SetGlobalMesh (mesh);
@@ -414,7 +412,6 @@ NGCORE_API_EXPORT void ExportGeom2d(py::module &m)
                     throw Exception("Meshing failed!");
 		  return mesh;
                 }, py::arg("mp") = nullopt,
-      py::call_guard<py::gil_scoped_release>(),
       meshingparameter_description.c_str())
     .def("_SetDomainTensorMeshing", &SplineGeometry2d::SetDomainTensorMeshing)
     ;
@@ -466,10 +463,8 @@ NGCORE_API_EXPORT void ExportGeom2d(py::module &m)
 		{
                   MeshingParameters mp;
                   if(pars) mp = *pars;
-                  {
-                    py::gil_scoped_acquire aq;
                     CreateMPfromKwargs(mp, kwargs);
-                  }
+                  py::gil_scoped_release gil_release;
 		  auto mesh = make_shared<Mesh>();
                   auto geo = self.GenerateSplineGeometry();
                   mesh->SetGeometry(geo);
@@ -480,7 +475,6 @@ NGCORE_API_EXPORT void ExportGeom2d(py::module &m)
                     throw Exception("Meshing failed!");
 		  return mesh;
                 }, py::arg("mp") = nullopt,
-      py::call_guard<py::gil_scoped_release>(),
       meshingparameter_description.c_str())
     ;
 
diff --git a/libsrc/occ/python_occ.cpp b/libsrc/occ/python_occ.cpp
index 8f95f0e2..5d7521ed 100644
--- a/libsrc/occ/python_occ.cpp
+++ b/libsrc/occ/python_occ.cpp
@@ -243,17 +243,15 @@ DLL_HEADER void ExportNgOCC(py::module &m)
                          {
                            MeshingParameters mp;
                            OCCParameters occparam;
-                           {
-                             py::gil_scoped_acquire aq;
-                             if(pars)
-                               {
-                                 auto mp_kwargs = CreateDictFromFlags(pars->geometrySpecificParameters);
-                                 CreateOCCParametersFromKwargs(occparam, mp_kwargs);
-                                 mp = *pars;
-                               }
-                             CreateOCCParametersFromKwargs(occparam, kwargs);
-                             CreateMPfromKwargs(mp, kwargs);
-                           }
+                           if(pars)
+                             {
+                               auto mp_kwargs = CreateDictFromFlags(pars->geometrySpecificParameters);
+                               CreateOCCParametersFromKwargs(occparam, mp_kwargs);
+                               mp = *pars;
+                             }
+                           CreateOCCParametersFromKwargs(occparam, kwargs);
+                           CreateMPfromKwargs(mp, kwargs);
+                           py::gil_scoped_release gil_release;
                            geo->SetOCCParameters(occparam);
                            if(!mesh)
                              mesh = make_shared<Mesh>();
@@ -279,7 +277,7 @@ DLL_HEADER void ExportNgOCC(py::module &m)
                              }
                            return mesh;
                          }, py::arg("mp") = nullptr, py::arg("comm")=NgMPI_Comm{},
-         py::arg("mesh")=nullptr, py::call_guard<py::gil_scoped_release>(),
+         py::arg("mesh")=nullptr,
          (meshingparameter_description + occparameter_description).c_str())
     .def_property_readonly("shape", [](const OCCGeometry & self) { return self.GetShape(); })
     ;