What happens if an older version wiki that has Relink installed as third party plugin will get updated to 5.4.0? Will it be a matter of going to Plugins tiddler, remove Relink and reinstall it from the core plugin library?
In my book, Relink is a strong contender for that one plugin that gets installed first into an empty wiki, and besides it being extremely functionally useful to end users (it does automatically what would be a scary wikitext programming task), if bringing it into the core will also yield speed improvements, I’ll be two times happier, because renaming tiddlers in a 10+MB wiki on a 5 years old smartphone introduces a noticeable lag while typing in the tiddler tittle text field, a lag that is big enough to break the fluidity of working with the wiki.