Long "Thread" lines in the MicroProfiler, what are these?

Hello my question is pretty straightforward, what are these?

There are multiple, stacked, long and short in the microprofiler

image

Any ideas of what this could be? Any help is appreciated, thank you!

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You’ll find almost anything in roblox documentation:

In really compact form, these lines represent the time lenght, about how long the function is running in thread.