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Hi, thanks for reaching out, and we're sorry about the trouble! 

Please share the version of Lightroom you're using along with your computer's operating system. Does Lightroom run slow while performing a specific task? 

You can try to reset the preferences of Lightroom by launching the app while pressing and holding the Shift + Alt keys. You should see a box asking you to confirm if you want to reset the preferences. When you do, click on yes to proceed.