I've just begun the process of migrating on-prem SharePoint to SharePoint Online, and I'll be using Metalogix's Content Matrix migration tool.
When reading the documentation, it mentions that the migration tool uses a fairly chatty API (CSOM). When discussing performance limitations of migration:
The very chatty nature of the CSOM API that is the primary API used for migration to SharePoint Online, compounded by the distance required for each API call to travel between on-prem environments and SPO.
The only context of chatty that I'm familiar with is network activity. Is that what this is referring to? If so, and if possible, could someone please provide any explanation of why an API (such as CSOM) might have intentionally been developed as chatty?