LR 5.0 slowly in rendering import previews (RAW/Canon 6D)

Hi guys,
does anybody know s.th. about slow rendering imagepreviews in the import dialogue?
My LR 5 is as slow as a snail generating those previews.
Importing my RAWs form the EOS 6D (saved on a 95MB/s 32 BG SanDisk Extreme Pro) it renders only the 12 or 24 displayed previews and leaves out the rest (the next only when I'm scrolling down). For 12 images LR5 needs 8-10 seconds. LR4.4 does the same process for all 150 RAWs in 1-2 seconds.
It doesn't matter if I want to import to my workstation (Dell Precision T1650, 8core Intel Xeon E3-1240 V2, 16GB RAM, 64bit) via USB 3.0 (Reader & Port) or to my laptop (Dell Latitude E6400). So it must be LR, not my hardware.
Are there known issues with the Canon-RAW format? I just updated EOS firmware to 1.1.3, but the renderspeed stays the same. For 1 image 3-4 seconds single...
@ Adobe-Experts: Could you please look after this very soon. Importing to different catalogs is not fun...
Thanks,
Ralf

Hi
I'm having a similar problem when importing Nikon NEFs into LR5 (true for two different cameras, D800 and D300). Rendering of previews is a) very slow (compared to LR4.4 installed on the same machine) and b) often incomplete, i.e. not for all files on the card a preview will be rendered (empty frames are displayed). Sometimes, scrolling the preview panel up and down remedies this, but there have been occasions where apart from rendering the first few previews, all the others remained empty no matter what I did. The irritating thing is that I have not found a pattern to this behaviour which would allow to find a root cause or which would allow a workaround.
Computer: i5-760 CPU, 8GB RAM, Win7 premium home edition. LR5 installed on a different physical drive than the catalog and pictures, and the cache file is yet on another drive.
I'm pretty confident that this is due to some issue in LR5 as importing with LR4 (or earlier versions, for that matter) showed none of these issues.

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