diff --git a/engine/Screen.cpp b/engine/Screen.cpp
index 9b8a308..5390d09 100644
--- a/engine/Screen.cpp
+++ b/engine/Screen.cpp
@@ -123,9 +123,6 @@ void Screen::drawText(const sf::Text &text) {
 
 // OpenGL functions
 void Screen::glDrawMesh(GLfloat *geometry, GLfloat *view, GLfloat *model, size_t count) {
-    // OpenGL:
-    // Make the window the active window for OpenGL calls
-    _window->setActive(true);
 
     glEnable(GL_CULL_FACE); // enable culling face
     glCullFace(GL_BACK); // cull faces from back
@@ -171,9 +168,6 @@ void Screen::glDrawMesh(GLfloat *geometry, GLfloat *view, GLfloat *model, size_t
 
     // Draw the mesh
     glDrawArrays(GL_TRIANGLES, 0, count);
-
-    // Make the window no longer the active window for OpenGL calls
-    _window->setActive(false);
 }
 
 GLfloat *Screen::glMeshToGLfloatArray(std::shared_ptr<Mesh> mesh, const Vec3D &cameraPosition) {
@@ -181,33 +175,36 @@ GLfloat *Screen::glMeshToGLfloatArray(std::shared_ptr<Mesh> mesh, const Vec3D &c
 
     auto *geometry = (GLfloat *) malloc(7 * 3 * triangles.size() * sizeof(GLfloat));
 
+    auto model = mesh->model();
+
     for (size_t i = 0; i < triangles.size(); i++) {
 
         int stride = 21 * i;
 
-        double dot[3];
-        sf::Color ambientColor[3];
-
-        Triangle MTriangle = triangles[i] * mesh->model();
+        Triangle MTriangle = triangles[i] * model;
+        Vec3D norm = MTriangle.norm();
 
         for (int k = 0; k < 3; k++) {
 
-            dot[k] = MTriangle.norm().dot((Vec3D(MTriangle[k]) - cameraPosition).normalized());
+            auto& tris = MTriangle[k];
+            float dot = norm.dot((Vec3D(tris) - cameraPosition).normalized());
 
-            sf::Color color = triangles[i].color();
-            ambientColor[k] = sf::Color(static_cast<sf::Uint8>(color.r * (0.3 * std::abs(dot[k]) + 0.7)),
-                                        static_cast<sf::Uint8>(color.g * (0.3 * std::abs(dot[k]) + 0.7)),
-                                        static_cast<sf::Uint8>(color.b * (0.3 * std::abs(dot[k]) + 0.7)),
-                                        static_cast<sf::Uint8>(color.a));
+            sf::Color color = MTriangle.color();
+            GLfloat ambientColor[4] = {
+                color.r * (0.3f * std::fabs(dot) + 0.7f) / 255.0f,
+                color.g * (0.3f * std::fabs(dot) + 0.7f) / 255.0f,
+                color.b * (0.3f * std::fabs(dot) + 0.7f) / 255.0f,
+                color.a / 255.0f
+            };
 
-            geometry[stride + 7 * k + 0] = static_cast<GLfloat>(MTriangle[k].x());
-            geometry[stride + 7 * k + 1] = static_cast<GLfloat>(MTriangle[k].y());
-            geometry[stride + 7 * k + 2] = static_cast<GLfloat>(MTriangle[k].z());
+            geometry[stride + 7 * k + 0] = static_cast<GLfloat>(tris.x());
+            geometry[stride + 7 * k + 1] = static_cast<GLfloat>(tris.y());
+            geometry[stride + 7 * k + 2] = static_cast<GLfloat>(tris.z());
 
-            geometry[stride + 7 * k + 3] = static_cast<GLfloat>(ambientColor[k].r) / 255.0f;
-            geometry[stride + 7 * k + 4] = static_cast<GLfloat>(ambientColor[k].g) / 255.0f;
-            geometry[stride + 7 * k + 5] = static_cast<GLfloat>(ambientColor[k].b) / 255.0f;
-            geometry[stride + 7 * k + 6] = static_cast<GLfloat>(ambientColor[k].a) / 255.0f;
+            geometry[stride + 7 * k + 3] = ambientColor[0];
+            geometry[stride + 7 * k + 4] = ambientColor[1];
+            geometry[stride + 7 * k + 5] = ambientColor[2];
+            geometry[stride + 7 * k + 6] = ambientColor[3];
         }
     }
     return geometry;
diff --git a/engine/Triangle.cpp b/engine/Triangle.cpp
index 8d25f1a..d488553 100644
--- a/engine/Triangle.cpp
+++ b/engine/Triangle.cpp
@@ -30,7 +30,7 @@ Vec3D Triangle::norm() const {
     }
 }
 
-Vec4D Triangle::operator[](int i) const {
+const Vec4D& Triangle::operator[](int i) const {
     return _points[i];
 }
 
diff --git a/engine/Triangle.h b/engine/Triangle.h
index 733ba4f..836c1c6 100644
--- a/engine/Triangle.h
+++ b/engine/Triangle.h
@@ -24,7 +24,7 @@ public:
 
     Triangle &operator=(const Triangle &) = default;
 
-    [[nodiscard]] Vec4D operator[](int i) const;
+    [[nodiscard]] const Vec4D& operator[](int i) const;
 
     [[nodiscard]] Vec3D norm() const;
 
diff --git a/engine/physics/HitBox.cpp b/engine/physics/HitBox.cpp
index 07b3f48..43f2f5c 100644
--- a/engine/physics/HitBox.cpp
+++ b/engine/physics/HitBox.cpp
@@ -2,6 +2,9 @@
 // Created by Иван Ильин on 04.11.2021.
 //
 
+#include <algorithm>
+#include <execution>
+
 #include "HitBox.h"
 #include "../Consts.h"
 
@@ -16,16 +19,12 @@ HitBox::HitBox(const Mesh &mesh) {
     _hitBox.shrink_to_fit();
 }
 
-void HitBox::_addIfUnique(const Vec3D &point) {
+void HitBox::_addIfUnique(Vec3D &&point) {
     bool addPoint = true;
-    for(const auto& p : _hitBox) {
-        if((p - point).sqrAbs() < Consts::EPS) {
-            addPoint = false;
-        }
-    }
-    if(addPoint) {
+    auto check = [&point](const auto& p) { return (p - point).sqrAbs() < Consts::EPS; };
+
+    if (std::find_if(std::execution::par, _hitBox.rbegin(), _hitBox.rend(), check) == _hitBox.rend())
         _hitBox.push_back(point);
-    }
 }
 
 HitBox HitBox::Box(const Mesh &mesh) {
diff --git a/engine/physics/HitBox.h b/engine/physics/HitBox.h
index 3afe05e..5af2725 100644
--- a/engine/physics/HitBox.h
+++ b/engine/physics/HitBox.h
@@ -11,7 +11,7 @@ class HitBox final {
 private:
     std::vector<Vec3D> _hitBox;
 
-    void _addIfUnique(const Vec3D &point);
+    void _addIfUnique(Vec3D &&point);
 
 public:
     HitBox() = default;
diff --git a/engine/physics/RigidBody.cpp b/engine/physics/RigidBody.cpp
index 45b0845..070f8b4 100644
--- a/engine/physics/RigidBody.cpp
+++ b/engine/physics/RigidBody.cpp
@@ -37,12 +37,11 @@ Vec3D RigidBody::_findFurthestPoint(const Vec3D &direction) {
      */
 
     for(auto & it : _hitBox) {
-        auto point = Vec3D(it);
-        double distance = point.dot(transformedDirection);
+        double distance = it.dot(transformedDirection);
 
         if (distance > maxDistance) {
             maxDistance = distance;
-            maxPoint = point;
+            maxPoint = it;
         }
     }