fastest way to add info to multiple lists

I made a network based file browser, its working fine, but the processing speed is way too slow even if its running on local computer. the data fron the remote computer is first processed and then added to two ListView controls and one listbox control. Can anyone tell me how to increase the processing speed.

Depends on what you're doing before you show it in the lists.

first I seperate dirs and files into two string, the string sent is something like below,
c:\windows$c:\dos$c:\progra~1$autoexec.bat$config.sys

then it seperates the dirs and adds them to the listview, then it seperates files and adds them ti listview. its working quite fine on smaller dirs, but is way too slow for larger dirs.