nodes: 743856
elements: 403211
one-dimensional elements: 0
two-dimensional elements: 0
integration points per element: 15
degrees of freedom per node: 3
layers per element: 1

distributed facial loads: 0
distributed volumetric loads: 0
concentrated loads: 1533336
single point constraints: 295113
multiple point constraints: 1
terms in all multiple point constraints: 1
tie constraints: 0
dependent nodes tied by cyclic constraints: 0
dependent nodes in pre-tension constraints: 0

sets: 5
terms in all sets: 2182467

materials: 1
constants per material and temperature: 2
temperature points per material: 1
plastic data points per material: 0

orientations: 0
amplitudes: 2
data points in all amplitudes: 2
print requests: 0
transformations: 0
property cards: 0

Not necessary. I should be good as long as the shape of the geometry is retained however, I tried applying mesh refinements (in PrePoMax) to reduce this and it still gives me the same mesh.

Do you have any suggestions on how I could reduce the number of cells on the edges whihc come as a default from PPM?

I cannot use shell since it is a more complex geometry and is likely to deform a lot after FSI.
I have not tried Pardiso.
Element type is C3D10 for all