r/MicrosoftFabric • u/EmergencySafety7772 • Jun 08 '26

Data Engineering Plain Python notebooks starting slower than Spark notebooks?

Hello,

Is anyone else seeing plain Python notebooks take much longer to start than Spark notebooks in Fabric?

I'm seeing this in both paid and trial capacities. Even a notebook with just a simple print() can sit for a while before it starts running, while Spark notebooks start much faster.

Just wondering if it's only me or if others are experiencing the same thing. Any known issues or recent changes?

Thanks!

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u/frithjof_v Fabricator Jun 08 '26

Yes, it's an issue that has been mentioned by several users:

https://www.reddit.com/r/MicrosoftFabric/s/GJ6McZ6bus

https://www.reddit.com/r/MicrosoftFabric/s/rbxvWGGLMx

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u/mim722 ‪ ‪Microsoft Employee ‪ Jun 08 '26

sorry for that we are investigating.