I am using ARCMAP 10.5 and trying to do fill operation on a DEM a basin SRTM 30 m data. The size of tif file is 256 MB and the approximate area of river basin is 312812 km^2. But, the fill operation is taking enormous time. Kindly help me what to do?

[KaranGupta]

I am doing watershed delienation using fill operation first. I want to reduce the time of computation. What steps can be taken?