Documentation on profiling @rustlang is limited, but https://llogiq.github.io/2015/07/15/profiling.html has some excellent examples (see also https://www.reddit.com/r/rust/comments/3dcquc/blog_profiling_rust_applications/ )
miniblog.
Related Posts
Blogged: Rustdoc Meets The Self-Documenting Editor https://www.wilfred.me.uk/blog/2016/08/27/rustdoc-meets-the-self-documenting-editor/ cc @rustlang
Working on displaying rustdoc in Emacs! Is this too much highlighting, Rust users? Feedback welcomed :) cc @rustlang
I am blown away by the error highlighting in @rustlang nightly! I love the "... and here" text for duplicate errors.

