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Same principle as #3518668: Use Fibers for rendering views rows. This will be most useful for multiple value reference fields such as for tags.
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Issue fork drupal-3519387
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Comment #3
catchComment #4
catchAnnoyingly this is not achieving what I hoped it would achieve, which is increasing the number of multiple loaded path aliases in conjunction with #3496369: Multiple load path aliases without the preload cache.
This is because the formatter builds a render array with a Url object, that hasn't yet been converted to a URL, so the Url::toString() call actually happens inside the foreach in field.html.twig which is not Fiber aware and won't be.
To make this work we'd need to render the field items before they get to field.html.twig or something like that.
However, the other way to get to the same eventual place is #3081346: Support auto-placeholdering for blocks placed in Layout Builder - if e.g. a term reference field is referenced via a field block in layout builder, then we get the same desired effect as long as other placeholders on the page also render URLs. Similarly with #3518656: Add Dynamic Page Cache and BigPipe support: `block` ComponentSource does not use placeholders/#lazy_builder.
Generally marking this postponed, not sure exactly on what yet.