Test the overhead of flow

The performance of Flow as a programming language has not been investigated since its creation.

The result of this investigate could help guide future optimizations in the actor compiler.

In addition, if the cost of creating actors is high enough, it may be worth unrolling some actors heavily called in the read and commit paths.

The issue names the Flow actor compiler and the read and commit paths, but no files or tests. Start by locating the actor compiler and measuring actor-creation overhead there; define the benchmark scope and optimization target before implementing anything.

Written by the indexing model from the issue text.