Environment - Sourceone 6.6

1 Master/Worker/Web

2 Native Archive

1 Worker/web

In the SourceOne console under Native Archive -> Server configuration there are 4 categories Archive, Index, Search, Retrieval.  On both of our archive servers we I have search and retrieval checked.  Does this mean that search and retrieval requests are actually handled by the Native Archive servers and not the worker/web servers?  We're having issues with searches taking a long time to complete, so I was going to add another worker/web to handle more requests.  But should I really be adding a Native Archive box?  Our workers are never that busy, but our native archives are busy during the day handling journalling jobs and the like.

Just a little confused on what's actually doing the work when a search or retrieval request comes in.

Thanks