I just finished off a PR I started quite a while ago to make some
substantial improvements to the HaloCatalog in the yt_astro_analysis
package. The major updates are:
- support for halo finding on a time-series for all halo finders (fof,
  hop, and rockstar). You no longer have to run the RockstarHaloFinder
  separately or call HaloCatalog in a loop for hop/fof.
- the loop over all halos in HaloCatalog now happens one io chunk at a
  time, instead of just querying ds.all_data(). This happens only on
  the root process now, significantly reducing io and time to being
  iterating.
- vastly updated halo finding documentation.

If anyone would like to offer comments on this, please find the pull