There is quite a bit of processing involved in an import (see
http://www.kinook.com/Forum/showthre...?threadid=1644 for more details on message import) which may not be performed by other apps. What sizes of delimited text files are you importing?
Export should be quite a bit faster than import (exported 3,700 items [~100MB] in 1 minute in a quick test on an AMD Athlon 64 X2 dual core w/ fast HD).
Are you importing and exporting large files on a regular basis? A faster CPU and hard drive might help in that case. Although I would not expect large imports to be done on a day-to-day basis.