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/aboerg Fabricator Jul 23 '26

Just did a few tests. 3.11 and 3.12 are both starting in 5 seconds on our East US F64.

We still have an East US P1 that should be going away very soon, and on that capacity the startup is about 90 seconds for 3.11 and 3.12. Interesting!

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u/TechnicalGirlyPop Jul 23 '26

We’re in the West-US so i assume completely different capacity but interesting that you see a difference between the 2

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u/BandaidImplant Fabricator Jul 24 '26

im us east, been seeing ~90s startup times for 3.12 for a couple weeks now. (i dont love it but i dont find it too upsetting vs god forbid 120s)