On a new 7200RPM Sata 2TB Western Digital we installed Windows 10 Professional clean. The we only installed Lightroom CC and Photoshop CC. Both programs worked flawlessly for a few days. Performance was within all standards we have read about. We were happy with this. On the 4th day Jarod Platt's and other presets were re-installed, a day later slider performance became slow, and clicking on a new photo on the "filmstrip" line at the bottom of the Develop module was slow to refresh to the new photo. The question is, "Could presets cause performance issues"? Or has anyone experienced something similar?
What do the presets do?
If you have the graphics acceleration turned on, adjustment brushes can sometimes cause a slowdown.