He doubled his performance by just switching the firebird client : We’ve just built and tested ‘libfbclient.so’ from the head branch and tested it against the release version 2.0.3. In other words, we only switched out the client library, and left the database server itself intact at version 2.0.3. The performance improvement is huge: fbclient-head: 6% processing time spent in ‘futex’ fbclient-2.0.3: [...]