Profile + Optimize Ad-hoc meshing performance

[fm3]

Some Ad-hoc meshing (a.k.a. isosurface) datastore requests failed with 30s timeouts. Since the chunk size is relatively small, this duration is suspiciously long. Maybe something could be optimized here. Note that an agglomerate mapping was used.

See https://scm.slack.com/archives/C5AKLAV0B/p1660202387222069?thread_ts=1660202133.556449&cid=C5AKLAV0B for details on the requests in question