Cleanup service extremly slow


We are using Nexus OSS v3.43 installed a rhel machine (8 CPU & 32Gb of ram). We are trying to use the Cleanup service to clean our maven snapshot repository and the task is never able to finish. This task is now running since 15 days. We are using a blobstore only for the maven artifacts. This blobstore is now at 261 Gb (blob count ~2557699). What can be the issue? Too many components for the OrientDB? Should we use another kind of task for maven artifacts? In the previous installation we were using the maven unused snapshot task.

Thx a lot for helping me on this.