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We don't have performance comparisons for the various versions of Berkeley DB. As a general statement, we work on performance projects in each new release of Berkeley DB. However, it is difficult to say whether you'll get a 2X performance improvement for your workload simply by upgrading the BDB version.
Having said that, I'd definitely recommend that
a) you upgrade to the latest release at the earliest convenient opportunity. We've added many new features and enhancements since BDB 4.5.
b) you look into optimizing your existing Berkeley DB configuration and application. Quite often, we find that performance can be improved significantly as a result. We're happy to help with that, but we'll need a lot more detail about your app and set up. My suggestion is that you spend some time analyzing and tuning the application and then post your questions to the forum.
Hope this helps.
Thanks and warm regards.