Toronto-based Altamira Investment Services Inc. has raised the rates on its High-Interest CashPerformer to 3.75% and its US$ High-Interest CashPerformer to 4.5%. “There is increasing demand for secure, high-interest investments in both Canadian and U.S. dollars,” James Whitman, Altamira’s senior vice president of sales and services, said in a release. There are no account fees, service charges nor minimum balance for CashPerformer accounts. Altamira pays advisors a O.25% trailer on the accounts.