Ppx rewriter that records top-level module startup timeshttps://opam.ocaml.org/packages/ppx_module_timer
A ppx extension to record module startup times.
Modules using ppx_module_timer now have instrumentation to record their startup
time. If the environment variable PPX_MODULE_TIMER is set (to anything), each
module records its startup time, and before exiting the process prints out all
of the module times in the order they occurred.