The autocomplete trickiness is fun. Looks (from links in GitHub) like it's using full-text search and currently needs to scan a lot to rank results. Doing just prefix search might be a cheap half-solution to autocomplete, and maybe layering on hacks around stopwords etc. can get you a bit further.
For another angle, enwiki's full compressed list of titles (enwiki-20210720-all-titles-in-ns0.gz) is 86MB. Grabbing the whole dang thing (in the background?) and doing something with it client-side is a different sort of approach from what this page is going for but not unthinkable.
The autocomplete trickiness is fun. Looks (from links in GitHub) like it's using full-text search and currently needs to scan a lot to rank results. Doing just prefix search might be a cheap half-solution to autocomplete, and maybe layering on hacks around stopwords etc. can get you a bit further.
For another angle, enwiki's full compressed list of titles (enwiki-20210720-all-titles-in-ns0.gz) is 86MB. Grabbing the whole dang thing (in the background?) and doing something with it client-side is a different sort of approach from what this page is going for but not unthinkable.