Thanks for the simulation file.
I assume you do not have the CAD license on cluster otherwise you could directly run simulations there rather than your PC. If this is the case, unfortunately there is not much that we can do. Engine license is meant to run the simulation files as they are saved and if the “auto update selected modes” box is unchecked, it will not update the mode source.
The only options would be to perform the sweep in a faster PC, or find ways to speed up the mode source updating stage. For example, you can set the number of trial modes to 2 (since you are interested in fundamental TE mode), and search near n=2.25:
Also, decreasing FDTD span in the x and y direction, say 2um on each side, will be quite useful. Using a coarser FDTD mesh accuracy and a mesh override on the middle object will be a great help too.
Sorry that I was not too much of help, but let me know if you had further questions.