catboost / catboost/catboost

Extremely slow if I tune rsm (mtry)

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performance R
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Description

Problem:
I'm tuning the hyperparameters (using R) and even though everything is working just fine, I almost never tune rsm since it's extremely slow. What is the reason for this?

catboost version:
0.26.1

Operating System:
Windows 10

CPU:
Intel(R) Core(TM) i5-8350U CPU @ 1.70GHz 1.90 GHz

This has also happend on quite larger virtual machines with other catboost versions (on Windows).

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