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Comparing Two Traces for Latency Optimization: Is It Possible? | Arize AI Community

Phoenix Support

Phoenix Support

Comparing Two Traces for Latency Optimization: Is It Possible?

·Jul 30, 2025 01:36 PM

There’s not a way to open 2 traces side by side, is there? The use case I have is optimizing for latency. 2 traces with the same shape and I’d like to compare timelines before + after

5 comments

· Sorted by Oldest

RunLLM
APP
·
Phoenix does not currently support viewing two traces side by side in the UI for direct timeline comparison. The trace detail view allows you to inspect a single trace and its spans, but there is no built-in feature for side-by-side trace comparison or timeline overlay as of now. This limitation has been noted as a feature request by users, especially for latency optimization use cases, but it is not implemented yet (<https://github.com/Arize-ai/phoenix/issues/6760|GitHub Issue #6760>; see also <https://arize-ai.slack.com/archives/C04R3GXC8HK/p1741724335.448719|Slack discussion>). Would you like more detail on possible workarounds or how to export trace data for external comparison? Sources: - <https://arize-ai.slack.com/archives/C04R3GXC8HK/p1741724335.448719|Slack discussion> - <https://github.com/Arize-ai/phoenix/issues/6760|GitHub Issue #6760>
💡 Hint: Mention RunLLM in the thread for followups.
Mikyo
·
Ben M. there isn’t. But it makes a lot of sense. From what view would you want to select 2? Would the two traces be correlated in the context of an experiment example or would you want some sort of ID system that linked the two?
Ben M.
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When I tried to do it, i treated it a lot like the experiments flow. I went to /projects/{project_id}/spans and checked the box next to the 2 root spans that I was hoping to compare
Ben M.
·
I don’t think it has to be correlated in the database, just having this client side would be helpful
Mikyo
·
Got it, that’s doable for sure
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