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Update Performance-Problems.md

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@ -1,19 +1,5 @@
## Eek! Performance Problems
<!-- START doctoc generated TOC please keep comment here to allow auto update -->
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
## Table Of Contents
- [1. Is It The `debug` Interceptor?](#1-is-it-the-debug-interceptor)
- [2. `=` On Big Structures](#2--on-big-structures)
- [An Example Of Problem 2](#an-example-of-problem-2)
- [Solutions To Problem 2](#solutions-to-problem-2)
- [3. Are you Using a React `key`?](#3-are-you-using-a-react-key)
- [4. Callback Functions](#4-callback-functions)
- [A Weapon](#a-weapon)
<!-- END doctoc generated TOC please keep comment here to allow auto update -->
## 1. Is It The `debug` Interceptor?
This first one is something of a non-problem.
@ -155,12 +141,12 @@ But like I say, don't be too paranoid about this, it is unlikely
to be an issue unless you have something like a table with a
lot of identical cells.
## Use The Trace, Luke
## Use The Trace
If you want to really track down what is going on, Luke, take advice from Edna Mode and get some X-Ray vision
from the [official tracer](https://github.com/Day8/re-frame-trace). But, no capes!
If you want to know exactly what's going on, get some X-Ray vision
from the [official tracer](https://github.com/Day8/re-frame-trace). See exactly what subscriptions are running, what views are getting re-rendered, etc.
Er, except, it is still a WIP. So, yeah, some overhyping in the previous paragraph. But, anyway, you may be surprised by what the trace tells you.
You may be surprised by what you see.
## The Old Weapon
@ -175,3 +161,7 @@ add tracing when poking about.
<!-- START doctoc generated TOC please keep comment here to allow auto update -->
<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
<!-- END doctoc generated TOC please keep comment here to allow auto update -->