time tracing in nginx

[Richard Kearsley]

Hi
I get some incoming requests that take longer to complete than others for no particular reason that I can see (goes from 0.03s to above 1s for the exact same file from the exact same host)
Is there any way to add debug/tracing log so I can see which part of my config this time gets lost on?
The server does over 100 requests/sec and I'm finding it very difficult to trace which part is taking long to complete sometimes.

Many thanks

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