Thanks for posting on Adobe forums and providing the details about the issue you're facing.
To diagnose the issue, lets try disabling use of graphics processor in Lightroom, which mostly does cause this issue.
To do so, open Lightroom preferences from Edit>Preferences, head over to the Performance tab and uncheck "Use graphics processor".
Restart Lightroom to allow save the changes.
Let us know if that helps.
Thank you, it actually helped. Does the perfomance stay the same ?
Performance will only help if the GPU you have is updated and working fine with Lightroom.
Its is better to use Lr without the GPU disabled if its causing issues otherwise. See Adobe Lightroom GPU Troubleshooting and FAQ for more info.