I guess in a world where jet.com and Slack exist, it's easy to see many of these as "slow" growth. Avast has been 56% annualized growth over 2008-2014. Getting these valuations typically takes high $X0mil revenue or more, meaning most of them over a 7 year period of annualizing their growth at 50%+. 50%+ growth is pretty impressive, and I don't think there are many people who would think of that as "slow" or "patient".