# Feature request The migration of Duration events to Complete events would be extremely useful here, as they essentially capture the same information in half the file size. <!-- This issue should serve for you to present or pitch an idea to the maintainers - but remember that it would be better if you were to submit a PR instead 🤗 --> ## Why it is needed For more context, please read the Complete Events section of [Trace Event Format Document](https://docs.google.com/document/d/1CvAClvFfyA5R-PhYUmn5OOQtYMH4h6I0nSsKchNAySU/preview). Theoretically, this should reduce the file size by a factor of 2 🎉 <!-- Please tell us a bit more of why you want this feature to be added, what's its origin. --> ## Possible implementation Keeping track of current and last active nodes, we can clearly determine all the events that are starting and ending at a particular timestamp. A way to implement this would be to add all the start events (along with their timestamp of starting) in a hashMap, and only add the chrome events object after they have completed (duration can be obtained by subtracting end/current and start timestamps) <!-- It really helps if you could describe from a technical POV how this new feature would work, which code it rely on, etc. -->