Anthony Quintano/Flickr"I think there is so much potential in Twitter that we haven't yet unveiled," said Twitter co-founder and board member Evan Williams in a CNBC interview last October. Williams said he expected bold and innovative changes to come in a matter of "months," and that he was confident the company's returning CEO and co-founder Jack Dorsey was ready to deliver on these expectations. Nearly five months later, Twitter stock is down about 48% and the company's pace of execution in product innovation continues to disappoint. And Twitter's Tuesday-announced change in how it counts characters puts the spotlight on management's unimpressive pace of execution. Too small, too slow A change to how Twitter counts characters for its tweets was much anticipated and long awaited.