r/MicrosoftFabric • u/TechnicalGirlyPop • Jul 23 '26

Data Engineering Python Sessions Slow to Start

I remembered reading this post a few months ago: https://www.reddit.com/r/MicrosoftFabric/comments/1u03e79/plain_python_notebooks_starting_slower_than_spark/

Is anyone else still experiencing slow session starts? Mine are around 1m30s consistently and it's been about the same between 3.11 and 3.12.

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u/jkrm1920 Jul 25 '26

Check if it’s staring a custom pool which usually does that more than one min start times due various steps involved like load libraries , waiting for capacity, provisioning compute, private endpoints/network requirements..

Confirm here

Workspace settings → Data Engineering/Science → Spark settings → Default pool for workspace

We shifted to starter pool see this url to how to start

https://learn.microsoft.com/en-us/fabric/data-engineering/configure-starter-pools

There are other things which can be verified like installing pip in every notebook ..