Faster is better than slower.

Postgres is amazing. When I use Sqlite I miss many of its upsides--better data migrations and better concurrency being two. But queries are not free, and sometimes are slower than I'd like even with the right indexes. And for OLAP-like queries like the one in TFA you might say "well, just don't use postgres for that," but wouldn't it be better if you could? If you could use one database instead of two, or use your favourite database in more places instead of reaching for a different tool?