Quite a lot of people had the LG KS360, and found it very slow, I know at least 10 people who have had it and somethings gone wrong with it! Ive had the LG GW520 which is kind of similar and very slow for viewing pictures - I believe the KS360 was the same.
I think its just an LG thing in general to be honest. Wouldn't recommend this phone im afraid...