Since the last update, in both Library and Develop, about every 20 seconds Lightroom goes into a Not Responding state. This lasts for several seconds before working again, but it is very very slow when it works in both modules. For instance, when reviewing images to Pick or Reject, it takes between 5 and 8 seconds from an X (reject), right arrow to the next image, before it becomes active. it's really painful. Can anyone help? Ive disabled my Graphics Processor, ive increased cache but to no avail.