Slow Kernel startup/restart

[claudiaregio]

[greazer]

This is one of those issues that can be a killer for retention. It falls in line with a theme of improving our kernel startup story in October.

[DonJayamanne]

See here #6702 & #7855
I've already started looking into this and found plenty of places that can be improved.

This is actually a regression

[DonJayamanne]

Solutions

• Caching for improvements in kernel startup #6702
• Some kernels do a lot of processing on start so appear to be slow to start running cells #7952
• Support pre-warming kernels #7903
• Auto starting kernels for native notebooks was turned off (not interarctive as well) #7624
• Skip checking ipykernel if interpreter has a kernel with kernelspec that has debugger flag set #8196
• Avoid searching for Jupyter when using Raw Kernels (when Python runtime isn't necessary) #8350
• Remove starting of a session and disposing it when connecting to remote Jupyter servers #8185

[rchiodo]

Not really verifiable. Going to have to wait for user feedback.

[de-loots1994]

Still an issue, the largest issue that the behaviour is unpredictable. In our dev team for some people it takes seconds others it doesn't start up at all and keeps saying:

[DonJayamanne]

Still an issue, the largest issue that the behaviour is unpredictable. In our dev team for some people it takes seconds others it doesn't start up at all and keeps saying:

I'm sorry about this, please could you file an issue with the details requested in the issue template (i.e. provide the logs)

[de-loots1994]

@DonJayamanne our issue seems to be resolved it appears that it has to do with the ipykernel not being active, and with pip install it goes wrong but when getting the pop up from vs code e.g:

It works...