To retrieve the file/folder icons on a network drive isn't the most speedy process. (The process is performed by windows via API (by reading / extracting the icon). Sometimes it's difficult to match the same performance provided by Windows Explorer, MS software has more access to the underlaying OS, plus they have some tricks up their selves by using undocumented features not avilable to everyone. A slow hard drive will slow this down even further, Also some files/folders take longer to get the icon than others.
FlashFXP retrieves the icon from the specific file, just like windows explorer. Rather than the default icon for that file type. Although in your situation it sounds like this method is faster.
One other solution aside from using the default file type icons is to cache the icon while building the file list however overall this method seems much slower.
Windows Explorer extracts the icon as you scroll.
An alternative method could probably be introduced into the next up-in-coming release, however I'm not entirely sure what that method would be at this time.
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