Hi Imran,
There is an option in the Dynamic Tag>Collision>Shape>Another Object.
This object should be, of course, be as similar in shape, but low-resolution mesh.
I suggest keeping the axis of the proxy-object in the same position.
To see those shapes, especially how they are applied: Attribute Manager> Mode> Project> Dynamics> Visualization.
How to get a low res. mesh?
Polygon reduction would be the sloppy way, modeling a new one the preferred method. Yes, I know, do it 40 times is perhaps not fun.
Example:
https://www.amazon.com/clouddrive/share/p2X0f9aRngGpFVsj6wGSttwYpITdQubUDIMqXfmPN10
Certainly, cache the results.
As an alternative, use a Particle set up, if the Dynamic is not required to be precise.
All the best