We plan to run short field trials of --site-per-process mode on Canary and Dev channels, to gather data about its impact on Chrome's process count and resource usage. Our estimates indicate this mode will likely be too expensive to launch as is, so we are not filing a full launch bug or intending for this to reach Beta or Stable.
The data from the experiment will help us decide on an appropriate policy for how many sites can require dedicated processes.
Experiment doc (internal):
go/site-per-process-experiments
Comment 1 by bugdroid1@chromium.org
, Sep 1 2017