MM2 group offset sync is very slow

Hi:
When I am running MM2 (3.4.0), any new message/topic got synced immediately.
However, the group offset takes long time to sync, (around 10m), is there any setting I am missing?

I have following setting for the sync:
enabled: true
topics: NASHCM.KAFKA.MIGRATION.OFFSET.TEST
sync.group.offsets: true

Global setings:
sync.topic.acls.enabled: false
tasks.max: 10
emit.checkpoints.enabled: true
sync.group.offsets.enabled: true

replication.policy.separator:


Thanks
Andrew



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