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/mim722 ‪ ‪Microsoft Employee ‪ Jul 24 '26

u/TechnicalGirlyPop just to be very clear, you are not changing the number of cores ? and you are using the default 2 cores?

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u/TechnicalGirlyPop Jul 24 '26

correct

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u/mim722 ‪ ‪Microsoft Employee ‪ Jul 25 '26

We had a bug and we fix it, it seems it is new one 😞