Thanks a lot for your comment! We agree that a dataset as small as 5 GB may sound strange but it was a conscious decision. Check out our blog post to read more about the methodology of this benchmark itself.
Great results! Refreshing to see a project that actually went the extra mile and built the core search engine in C++ from scratch, unlike most similar projects that just wrap an existing library.
https://blog.serenedb.com/search-benchmark-game-overview