Having a stock that can double its value in just a year is an incredible feat, and investors will typically shy away from these fast runners, often over high valuations or concerns that the best days might already be behind them. In some cases, avoiding such high flyers can be a mistake, as that type of sterling performance could also be a precursor of what is yet to come.A number of these companies can be found in the software-as-a-service (SaaS) market, the largest segment of the cloud computing industry.