The replication of GN4 volumes may be faster if you reduce at the minimum the number of folder to replicate.

This may be especially important if using Robocopy solution, as the analysis of the changed files done by robocopy can take a long time, more than the time it is actually required to copy the changed files.

The solution, especially in the GN4 systems that include the archive (which is the default), is to create separate volumes as explained in Use different volumes by partition.

See also

Excluding folders from replication