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Update UnderstandingTiming.md

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This document highlights important aspects of the "Timing" tab. A few notes on the "Timing" tab in `re-frame-trace`.
## Be Cautious And Sceptical ### Be Cautious And Sceptical
There are two issues with the displayed numbers: There are two issues with the displayed numbers:
@ -8,15 +8,11 @@ There are two issues with the displayed numbers:
a fool's errand. One moment it takes 1ms and the next it a fool's errand. One moment it takes 1ms and the next it
takes 10ms, and you’ll never know why. Noisy. takes 10ms, and you’ll never know why. Noisy.
So, don't ever base your decisions on one set of timings. Run So, don't ever base your decisions on one set of timings.
the same event at least a few of times. Click the "rerun" button (#115) a few times to see if you
get stable numbers.
In the future, we'd like to add a 'Run It Again' button, which 2. Don't freak out about any apparent slowness just yet.
you can click a few times to see if you get stable numbers.
Perhaps you'll beat us to it, and create a PR for this
feature?
2. Don't freak out about any apparent slowness, yet.
After all, you're running a dev build, right, not the After all, you're running a dev build, right, not the
production build? And I'm guessing you're also production build? And I'm guessing you're also
@ -35,7 +31,7 @@ There are two issues with the displayed numbers:
reason, compared to others? reason, compared to others?
And, even then, remember point 1 (above). And, even then, remember point 1 (above).
## Know Your Epoch Timeline ### Know Your Epoch Timeline
The Timing Tab is easier to understand once you have internalised the The Timing Tab is easier to understand once you have internalised the
following graphic which shows how, operationally, the six dominoes play out, following graphic which shows how, operationally, the six dominoes play out,
@ -43,7 +39,7 @@ over time, within the browser.
<img src="https://raw.githubusercontent.com/Day8/re-frame/master/images/epoch.png"> <img src="https://raw.githubusercontent.com/Day8/re-frame/master/images/epoch.png">
## Other Tips ### Other Tips
You should probably have [React DevTools](https://github.com/facebook/react-devtools) You should probably have [React DevTools](https://github.com/facebook/react-devtools)
installed because it is useful. But, it can also add drag and noise to timing results, installed because it is useful. But, it can also add drag and noise to timing results,