Priority Hints: https://github.com/WICG/priority-hints/blob/master/EXPLAINER.md
The origin trial is ongoing until May 29.
By targeting ruwiki, we could ensure that we stay below the usage limit (0.5% of all Chrome pageloads worldwide, which we might break if we launched to all wikis). And we would get performance perception survey results, which would inform us of whether or not users felt the difference.
I generated an origin trial token for ru.wikipedia.org:
It is set to expire on April 2. To renew it, we need to provide feedback about the trial.
I imagine that since the mobile site is technically a different subdomain, we would need to generate a separate token for it.
Chrome 73 graduates to stable on March 12.