I want to make animation on blender but first i need to see how speed my models in animation. Render is taking very long time and i can't use timeline because fps is very low. this mean i can't understand my models fast moving or slow moving. I want to take o video without render. How can do this?
You can do a preview render using the OpenGL renderer. This will pretty much be as quick as in the viewport.
More info in the Blender documentation: https://docs.blender.org/manual/en/latest/render/opengl.html