The custom fix to address increased Solr search setup times and slowed ICM back office product searches noticed with ICM 7.10.38.28-LTS & ICM 7.10.40.5 is now available. Please read the article for details and to download the custom fix:

Announcement - ICM 7.10.38.28-LTS & ICM 7.10.40.5 - Increase in Solr Search Index Build Times and Slower ICM Back Office Product Search Detected
https://support.intershop.com/kb/index.php/Display/31S108

Within our latest release ICM 7.10.38.28-LTS & ICM 7.10.40.5 an increase in Solr search index build times and a slower ICM Back Office Product search has been detected. We are currently analyzing the issue and will offer a solution as soon as possible.