Paul Irish's talk is a bit too technical for me. But while I was googling references I came across this line on his colleague Ilya Grigorik's personal site:
A GOAL IS A DREAM WITH A DEADLINE.
Other takeaways from Paul's talk:
Improving mobile performance.
- Bandwidth vs. Latency: impact on page loading time
- Video streaming is bandwidth; bandwidth is related to page size.
- Web browsing is latency; latency is related to how many requests the page sends.
- The performance waterfall - this I have to read a blog post to understand.