HikariCP has a Hibernate ConnectionProvider for Hibernate 4.x.

Re: performance
Based on discussions on the jClarity forum, the benchmark was re-written to address concerns raised there – DCE - dead code elimination by the JVM was rendering the results invalid. With DCE addressed, HikariCP's performance dropped noticeably, as did all pools in the tests. But after the dust settled, HikariCP is still coming in at 2x the nearest pool (BoneCP).

New benchmark results posted on the project page: https://github.com/brettwooldridge/HikariCP