To give readers a bit more context, I’ve extended my Hugo theme so that it will be displayed below each post if it is mentioned or linked in another post on my blog. This increases the build time from about 7 to about 17 seconds (on my machine it takes 2 seconds, but it is also much faster than the VPS), but I don’t know how I can make it more performant. After all, for each article it is necessary to iterate through all the other articles and see if the content contains a relative link to the post.
Update: I disabled this again, because I don’t like this much increased build time.