I have a CM-CD environment for production and I have noticed any time when uploading a csv via list manager, JVM-Memory spikes to - and maintains a range of - 77%-90%, from 45%-60%. I have implemented a custom contact facet. I have noticed that the standalone servers have no issue with 512mb, but had to increase JVM-memory to 1024mb on CM. The list being uploaded has 1 row and still causes a spike. I am not seeing any error messages on Solr logs. I feel like increasing JVM-memory is a band-aid solution here as our standalone servers are running efficiently with 512mb.
How may I debug this issue efficiently? Would using the List Manager API be useful with custom contact facets?