Should I use default Raw or convert to DNG?

Hello,
I have olympus SP570UZ and use LR 3. I'm not a professional photographer but do a lot of photography and shoot in raw. My question is should I use the default raw file for import/editing or should i convert to dng? does it effect editing capabilities and degrade the result when i convert to dng?
I work on laptop and it seems a lot slower in loading default raw files. Will this improve my overall work time and lower load on cpu and space, but my first priority is picture quality?
Thank you.

Converting to DNG is really a matter of choice not necessity. If your camera is already supported by Lightroom / Camera Raw then there is little to be gained by converting the images to DNG at the beginning of your workflow. Many who champion DNG will keep their images in the camera vendors raw format until they've completed their edits and only then convert the final image to DNG.
In answer to other questions. Performance - DNG is not some magic bullet that will increase the performance of your family saloon into that of a Porsche. Space - The lossless compression used by DNG is more efficient than that used by the majority of other raw formats, but only saves space if you trash the originals after conversion. (Note - trashing your original raw files is not something that I would ever recommend let alone suggest.) Quality - There should be no difference in quality between the original raw file and the DNG version.
FWIW, DNG was originally proposed as standard "capture format" but as time has gone by and few camera vendors jumped on board Adobe's position has changed to "DNG is ideal as an archiving format". The latter is probably the less time consuming and more future proof approach. As mentioned above,it's also the approach adopted by many of those who champion the DNG format.
No doubt someone else will come along and add their tuppence worth for one or the other, but if previous threads on the same subject are any guide you'll still be left wondering. Try typing your original question into Google and see the mass of info and opinion that already exists. I can hear the sound of Hornets buzzing already.
Disclosure - I use DNG not raw throughout my workflow. This means that my thumbnails and previews accurately reflect the Adobe rendering in all of the applications "I" use. "I" don't use the camera vendors software (i.e. Canon DPP), so have no issues with the fact that it does not support DNG.

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