Christian Weyer ci fa notare che è nata un'altra specifica: WS-Performance.

"WS-Performance provides a neutral and Web Services friendly mechanism to indicate performance characteristics of Web Services specifications.

We have noticed that one of the most important concern when composing Web Services is impact on performance of each specification. Therefore if there could be a synthetic indicator of performance impact of each specification it could help to automate estimation of composed Web Services.

Initially we considered calling this compositional effect of Web Serviced a 'slowness' factor (or simply 'WS-Slowness') but as we firmly believe Web Services performance will improve due to Moore's Law we have chosen to concentrate on positive performance outlook for Web Services."