If you have been investing in DBS Group Holdings (SGX: D05) in the last few years, chances are, you wouldn't have much to crib about. DBS has enjoyed an exceptional few years, benefiting from higher interest rates and increasing contributions from its business segments, including wealth management. Net interest income (NII) fell 5% from a year ago, while net interest margin (NIM) narrowed to 1.89% amid falling interest rates. Higher fee income, stronger wealth management performance, and treasury customers' sales helped cushion the decline. It is worth comparing the current DBS multiples with the bank's historical averages and figuring out whether the market has already taken future growth into account.