Just FYI, if you are running on FastCGI this are additional changes needed to be able to import large quantities of resources in Windows/IIS:
In my case 7,000+ resources took more than 10 mins but it worked flawlessly.
Thanks a lot for such an awesome Extra.
Add this lines in fcgiext.ini
on your system32/inetsrv
Also make sure max_execution_time
in your loaded php.ini
is the same.
*You'll need to change [PHP] to whatever your instance of php is named.
Hope this info can be useful for modxers using windows. Took me a lot of time to figure out.