GiD forum

I am having a challenge reading post process files. The reading fem process information gets stuck at 0.1% or 0.7% and never progresses

Probably the results of the mesh files of post are bad.
Attach a zip file with the model to try it

Here is the a link to the Post process Zip folder:
https://uctcloud-my.sharepoint.com/:u:/ ... A?e=JiHB8W

your .msh files are wrong
e.g. fem.msh
declare a mesh of tetrahedra of 4 nodes, but the list of connectivies have 10 node ids
really they are quadratic tetrahedra of 10 nodes, must replace the 4 by 10

MESH dimension 3 ElemType Tetrahedra Nnode 4
Coordinates
1 5.041270256042e+01 7.250010013580e+01 5.618600368500e+01
...
48168 2.608970165253e+01 3.048140048981e+01 -1.543449997902e+01
end coordinates

Elements
1 28452 26933 26874 27569 27635 26904 27606 28018 27246 27229 0
...
36074 32979 34485 41538 39621 33672 38770 38138 36423 37247 40593 0
end elements

and then there is another bug, there are repeated elements and nodes
if you import the mesh you will see a 'rare boundary' because is considered as boundary a face that belong to 1 tetrahedron, in you case you define other tetrahedra with the same nodes
and also there are repeated nodes in the same x,y,z location
if you import the mesh (changing the 4 by 10) in render normal you will see all as you expect, but in render flat or smooth will see something unexpected, because only foundary faces are drawn.

If you collapse the mesh with a small tolerance (e.g 1e-30) a lot of nodes and elements are deleted, because are duplicated, the problem is that the remaining nodes and elements are renumbered and then the results won't match the ids of nodes or elements of the initial mesh.

Concluding, I don't know how were created the .msh files, but you must rebuild again fixing the bugs of 'number of connectivities 4->10, and deleting repeated elements and nodes before the calculation that create the .res results file.