New York City's largest public pension is exiting all hedge fund investments in the latest sign that the $4 trillion public pension sector is losing patience with these often secretive portfolios at a time of poor performance and high fees, Reuters reported yesterday. The board of the New York City Employees Retirement System voted to leave blue chip firms such as Brevan Howard and D.E. Shaw after their consultants said they can reach their targeted investment returns with less risky funds. The move by the fund, which had $51.2 billion in assets as of Jan. 31, follows a similar actions by the California Public Employees' Retirement System, the nation's largest public pension fund, and public pensions in Illinois.