The shoe company is growing rapidly, but shareholders' expectations may simply be too high.It's an interesting time for the sports apparel industry. A few massive companies, like Nike and Adidas, have ruled the space for years with product lines that cover a broad range of sports and activities. Recently, however, the big players have been challenged by upstarts and specialty brands like On Holding (ONON -0.76%).On, based in Switzerland, exploded onto the scene with its shoes aimed at serious runners. The s ...