Concerns over recent performance issues gave the San Francisco 49ers reason to consider releasing kicker David Akers.The ability to clear $3 million in needed salary-cap room at the same time made Akers' release inevitable."The 49ers would like to thank David for his service, dedication and leadership over the past two years," general manager Trent Baalke said in a statement announcing Akers' release. "He is a true professional who represented himself and this organization with class.