Adobe Lightroom is a great program unfortunately after a few days or even a few hours it slows down and gets functions slower and slower. Luckily there is a fairly easy fix to speed up LR
In a Windows machine:
Go to the Start Menu, type: %appdata%, open the Roaming folder, open the Adobe folder, open the LR folder, open the Preferences folder. Find the file named: Lightroom Preferences.agprefs and drag this file to the desktop, launch LR again and it should run faster.
Cancel the welcome pop up and begin using LR. If your preferences are still intact and LR is running well, move the Lightroom Preferences.agprefs file to the Recycle bin. Relaunch LR and if everything is still running well empty your Recycling bin.
Unfortunately LR will eventually bog down again and you’ll have to use this trick again to speed it back up. If you have a better fix or suggestions for improving this fix let us know by commenting below.