Adobe released Adobe Lightroom CC 2015.2.1 / 6.2.1. The new version will provide a performance fix related to Import and also fixes crashing bugs identified in the previous release.
Update #1: several readers reported issues also with the new Lightroom CC 2015.2.1 / 6.2.1 version (see the comments section).
Update #2: Adobe officially apologized for the failed Lightroom 6.2 update.