How do I reduce vertex count?

[FhelZone]

I got this cliff doodad model from the Ulimate Terraining Map and there is just too much polys that causes lag in-game. Is there any way I can reduce the poly? I am aware of a filter in blender that you just drag and drop on the model to instantly reduce them, however, I have no idea where to start with mdx.

If anyone can just do a significant reduction I would also appreciate that. This model is used in abundance within my map. MDX attached below.

 

[Idaero Ace]

Import to 3dsmax, export it as obj, import that blender. Or you can try the blender mdx import script.
Although I believe that “optimize” wont be really helping. Better just retopology the model