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You don't supply us with this information, but: did you create the .stl files yourself? If you did: what are their sizes? Could you show us the output of du -csh $rospack find mybot_descriptions)/src/meshes and ls -al $rospack find mybot_descriptions)/src/meshes?

Very long loading times are often caused by meshes that are way to detailed, which can happen if you've edited them in tools like SolidWorks (or similar) and then exported them without any further post-processing.

Also:

I am using ROS Kinetic Kame, VMware pro 15, Ubuntu 16.04 LTs

This is not going to help either: VMs are often slow and can have difficulty providing properly accelerated 3D graphics. Both RViz and Gazebo are heavy 3D applications and running them in VMs has caused problems for other users in the past.

You don't supply us with this information, but: did you create the .stl files yourself? If you did: what are their sizes? Could you show us the output of du -csh $rospack $(rospack find mybot_descriptions)/src/meshes and ls -al $rospack $(rospack find mybot_descriptions)/src/meshes?

Very long loading times are often caused by meshes that are way to detailed, which can happen if you've edited them in tools like SolidWorks (or similar) and then exported them without any further post-processing.

Also:

I am using ROS Kinetic Kame, VMware pro 15, Ubuntu 16.04 LTs

This is not going to help either: VMs are often slow and can have difficulty providing properly accelerated 3D graphics. Both RViz and Gazebo are heavy 3D applications and running them in VMs has caused problems for other users in the past.

You don't supply us with this information, but: did you create the .stl files yourself? If you did: what are their sizes? Could you show us the output of du -csh $(rospack find mybot_descriptions)/src/meshes and ls -al $(rospack find mybot_descriptions)/src/meshes?

Very long loading times are often caused by meshes that are way to detailed, which can happen if you've edited them in tools like SolidWorks (or similar) and then exported them without any further post-processing.

Also:

I am using ROS Kinetic Kame, VMware pro 15, Ubuntu 16.04 LTs

This is not going to help either: VMs are often slow and can have difficulty providing properly accelerated 3D graphics. Both RViz and Gazebo are heavy 3D applications and running them in VMs has caused problems for other users in the past.

You don't supply us with this information, but: did you create the .stl files yourself? If you did: what are their sizes? Could you show us the output of du -csh $(rospack find mybot_descriptions)/src/meshes and ls -al $(rospack find mybot_descriptions)/src/meshes?

Very long loading times are often caused by meshes that are way to detailed, which can happen if you've edited them in tools like SolidWorks (or similar) and then exported them without any further post-processing.

Also:

I am using ROS Kinetic Kame, VMware pro 15, Ubuntu 16.04 LTs

This is not going to help either: VMs are often slow and can have difficulty providing properly accelerated 3D graphics. Both RViz and Gazebo are heavy 3D applications and running them in VMs has caused problems for other users in the past.

It could be RViz is forced to use Software OpenGL, which would make it very slow.

Finally:

the first is I have created an urdf model of Robot(see image)

there is no image in your post.

You don't supply us with this information, but: did you create the .stl files yourself? If you did: what are their sizes? Could you show us the output of du -csh $(rospack find mybot_descriptions)/src/meshes and ls -al $(rospack find mybot_descriptions)/src/meshes?

Very long loading times are often caused by meshes that are way to too detailed, which can happen if you've edited them in tools like SolidWorks (or similar) and then exported them without any further post-processing.

Also:

I am using ROS Kinetic Kame, VMware pro 15, Ubuntu 16.04 LTs

This is not going to help either: VMs are often slow and can have difficulty providing properly accelerated 3D graphics. Both RViz and Gazebo are heavy 3D applications and running them in VMs has caused problems for other users in the past.

It could be RViz is forced to use Software OpenGL, which would make it very slow.

Finally:

the first is I have created an urdf model of Robot(see image)

there is no image in your post.