while ( engine.BeginFrame() )
        {
            for ( int i = 0; i < SIZE; i++ )
            {
                int x = rand() % 740;
                int y = rand() % 540;
                spr.Draw(x, y);
            }

            engine.EndFrame();
        }

BeginFrame()
......................................................................
bool Engine::BeginFrame()
    {
        if ( glfwWindowShouldClose(m_window) )
            return false;

        m_render->BeginFrame();

        return true;
    }
    void Render::BeginFrame()
    {
        glClear(GL_COLOR_BUFFER_BIT);
    }

......................................................................

EndFrame()
......................................................................
    void Engine::EndFrame()
    {
        glfwSwapBuffers(m_window);
        glfwPollEvents();
    }


......................................................................

spr.Draw
......................................................................
    void Sprite::Draw(float x, float y)
    {
        Render::Get().GetDefQuad().Draw(glm::vec3(x, y, 0));
    }

    void Quad::Draw(const glm::vec3 &pos)
    {
        if ( (m_pos != pos) || Camera2D::Get().IsUpdate() || Render::Get().IsResize() )
        {
            m_pos = pos;
            m_defshaders.UpdateUniform(m_pvw_mat, Render::Get().GetOrthoMatrix()*Camera2D::Get().GetViewMatrix() * glm::translate(m_pos));
        }

        glDrawArrays(GL_TRIANGLE_FAN, 0, 4); // <<<--- тормозит тут
    }