Query performance measuring tool

How do I monitor the search performance for an Index, wherein data is constantly getting indexed.
I want to restrict the size of the Index wherein the search performance starts degrading with new incoming data.
We have around 100 TB of data to be indexed.
Is there any tool which would help in Analyzing this ?

Are you using the inbuilt Monitoring?

You can use Stack Monitoring (as mentioned by @warkolm above) or if query is being executed from DevConsole, there's a tab next to Console to view the time taken at each process of search.

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