As mentioned, we are planning an update on FillDB and can provide some stats content there (we have broken down analysis on stats processing etc.).
As for insertion rates, they are semi-meaningless on their own (especially with “uncontrolled” workloads). Typically infrastructure latency (IO, process) are the first points of understanding (and something we cover). We will publish more detailed data on FillDB performance, likely including insertion rates, once our current set of improvements are delivered.