Long import times Ricoh GX100 to LR versions 1.3 & 1.4

Question

Compared with importing 10mp raw files originated in a Pentax K10D, similar size files from my new Ricoh GX100 seem to take an eternity. (10x longer is typical). I shoot and record DNG files in both cameras which should import into Lightroom without problems. I use SanDisk Ultra II 2Mb cards in both cameras.
Has anyone experienced such lengthy import times from the GX100? If not, can anyone suggest the cause and a possible remedy? (The Ricoh GX100 won several awards last year so I cannot believe the camera is intrinsically slow).
Many thanks
David

Answer 1

Don, thank you for your ideas. I have carried out a trial shooting the same scene five times on the same SD card in the K10D and GX100. In each case I formatted the card in the respective camera. The card was a SanDisk Ultra II.
I then imported each batch of five pictures into LR copying the photos to a new folder, importing and rendering the new images.
The K10D completed the task in 4 min 20 seconds
The GX100 completed the task in 16 minutes 50 seconds.
K10D file size is 16.25mb and measures 3872x2592 pixels
GX100 files size is 14.44mb and measures 3648 x 2736 pixels
So you can see that import and rendering times are about four times longer for the Ricoh files. But, the Pentax files are slightly bigger. You can see why downloading 100 files gets frustrating!
I wonder whether DNG files conform tightly to a standard. (Only Adobe would be able to tell that). I used one card in my experiment in case an earlier card of like specification performed more slowly. The scenes were identical to minimize another variable.
Windows XP 2Gz Pentium 4 processor and loads of memory.
Puzzling, isn't it?
David