Only three metrics matter for your online business
wingify.com
wingify.com
Also, may I know why exactly you mentioned 50% growth and anything less to be a matter of concern?
Metrics like visitors and pageviews are vanity metrics for a startup and it can lead to false sense of complacency.
Yes, I agree there is nothing special about 50%. (Post was written about a year ago, forgot why I wrote that) My point is that there should be healthy growth in paid customers (not just visitors).