https://www.dropboxforum.com/hc/en-us/community/posts/202007985-CPU-usage-making-version-3-intolerable?input_string=Intolerable
Basically have the same issue. Very frustrated.
I tried to move/delete a single picture from camera upload folder to another folder to organize my pictures, but every time I have to wait about 10 seconds or longer for ONE copy & paste action.
I am grateful that I can auto upload all my pictures & videos from my iPhone to the cloud but Dropbox makes it impossible for me to organize them. Now I have tons of pictures & videos that i could impossibly move them out of the camera upload folder.
Dropbox discontinued support to 10.5.8 (which was a HUGE inconvenience) where I had dropbox worked perfectly fine for me. Since I was unable to upgrade to newer version on my old iMac and I do find the needs anyway to upgrade my computing power, I decided to purchase a new macbookpro running 10.10.2 w/ i7.
Sadly, Dropbox has failed me by using so much of CPU power which makes it impossible for me to move ONE single file from camera upload folder to another. I am not sure if any other user runs into this same problem but this will be my last year of $99 subscription as there are many other competitors out there.
Are we in stone age? I mean WINDOWS 98 can perform a copy & paste function better than DROPBOX. Very Frustrated. I have tons of files & videos that will forever pile up in my camera upload folder.