Some ideas:

When you are using roaming profiles the user profile will automatically
be transfer between client and server.
Important to know is that the logging process can be dramatically slow
down when
- number of directories and shortcuts is very great.
- number of temporary files (mostly the result of internet explorer
or other browsers)
- size of your email archive or file is very great.
Suggestion for reduction of it:
- remove unwanted shortcuts. possible to do it during the evening
on your server. all user profiles stay during the night on your server.
it is also possible to remove other unwanted files in those profiles.
==> unwanted shortcuts can be: uninstall and readme entries.
- point outlook files already on your server.
Greetings.

btw: mostly manager told your script is too slow, but mostly the amount of allocated MBytes slowdown your logging on process.