I've been using Lightroom 5 for a few years now and have been very happy with it but for some reason it has suddenly become really unresponsive on my Windows laptop - to the point that it is almost unusable. When I launch the program it takes ages to open and then everything is like treacle - from navigating around images in my library (can take 3 or 4 seconds to select the image I have clicked on and sometimes selects a different one) to switching between Develop and Library modules. When in Develop mode it lags behind what i'm selecting and zooming in and out is hit and miss. In fact it takes around ten to fifteen seconds to switch to Develop mode once I click on it. I only have a couple of thousand images in my library so it's not that it is under strain or anything. The only thing I can think of that has changed is that I installed Photoshop Elements 15 a while back, but I don't recall that causing the issues straight away. Anyone had the same kind of thing happen and know how to fix it?