> Is this maybe related to what Stefan said about the run start - so that odbedit needs some time to load the bigger ODB?

At the run start mlogger writes the ODB to the .mid file. This needs conversion (binary ODB -> XML ASCII) which can take time.
This does NOT depend on the ODB size, but on the ODB *content*. Every key in the ODB takes time to convert. So if your ODB as 1.5 GB
but only a few keys, this is still fast. Only if you have 200 million keys int he ODB, then mlogger takes lots of time to convert
200 million values to XML or JSON strings.

Stefan