Im using a tethered 5D mk3 to an SSD mac running Yosemite and finding it incredibly slow! Is this normal? One image is taking 5 seconds to appear on my screen?! I shoot quite quickly so may do a burst of say 30 images, then go to check the computer and hardly any images are loaded. Can anything be done to optimise and speed this up? If this wasn't bad enough, I get constant issues with it crashing also, whereby the camera has a meltdown and then lightroom tells me its importing files (which it isn'