RunnableBranch seems to add some overhead vs function with RunnableLambda

[qtangs]

In my env, RunnableBranch seems to take 0.5-1s longer compared to a simple if/else function with RunnableLambda.

The doc also recommends using function over RunnableBranch
https://python.langchain.com/v0.2/docs/how_to/routing/#using-a-custom-function-recommended

Anyone experiencing the same?

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RunnableBranch (notice the gap):

RunnableLambda:

(trace using OpenLLMetry and Google Cloud Trace)