David Mark Clements wrote an article describing how the new TurboFan compiler will address many of the traditional V8 performance pitfalls https://github.com/petkaantonov/bluebird/wiki/Optimization-killers:

https://www.nearform.com/blog/node-js-is-getting-a-new-v8-with-turbofan/

tl;dr: Performance of many "obvious" operations like try/catch and delete will become more reasonable. Some of the performance work-arounds we currently employ in perf-critical code (such as try/catch wrappers) won't be needed any more, and might actually perform worse on TurboFan.

TurboFan is expected to land in Node 8.3 or 8.4. The Node 8 series is going to be the next LTS release. We will upgrade to it once it has been LTS'ed.