Helm repository index frequently scheduled for rebuild

I have a Helm repository configured in Nexus. I’m seeing slow performance pulling charts. In the Nexus logs I’m see this repeating frequently, sometimes as often as every minute. This is not due to new charts being pushed to the repo, at these times it’s just helm install commands pulling charts.

2023-01-12 11:04:24,932-0500 INFO  [event-13-thread-70]  raveHelm org.sonatype.repository.helm.internal.orient.createindex.CreateIndexFacetImpl - Scheduling rebuild of Helm metadata to start in 1 seconds
2023-01-12 11:04:25,934-0500 INFO  [event-13-thread-89]  raveHelm org.sonatype.repository.helm.internal.orient.createindex.CreateIndexFacetImpl - Rebuilding Helm index for repository rave-helm
2023-01-12 11:04:27,422-0500 INFO  [event-13-thread-89]  raveHelm org.sonatype.repository.helm.internal.orient.createindex.CreateIndexFacetImpl - Finished rebuilding Helm index for repository rave-

Why is this happening so often, and is this configurable? Is it likely contributing to slow performance/timeouts?