A swift adapter was added to Sequel. Swift is a relatively new
ruby database library, built on top of a relatively new backend called
dbic++. While not yet considered production ready, it is very fast. The
swift adapter is about 33% faster and 40% more memory efficient for selects
than the postgres adapter using pg with sequel_pg, though it is slower and
less memory efficient for inserts and updates.
Sequel‘s swift adapter
currently supports only PostgreSQL and MySQL, but support for other
databases will probably be added in the future.