Std::getline(fstream, string) become much slow by using Cling of ROOT6.14.00

It seems that the flag increasing the performances of your macro is:

-DCMAKE_BUILD_TYPE=Debug

That’s super weird because usually the debug mode slow down the execution. This has to be investigated.

I’m looking at it. Thanks for analyzing the build config that causes it!

Understood. The fix will take a bit longer, but it’s very high on my priority list.

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Great! I rebuilt root6.13.08 with the option and got high performance.
@Axel Thank you for giving high priority for this issue!

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And fixed in master and v6-14.