It's easy to "claim" to do things better than what you currently have or do. However, how would you be able to measure the result, if you don't know what you currently have? Many agencies and companies claim to have the holy grail but that is the furthest from the truth. "Better" means you would measure current performance against new performance but also in the same feature. A faster website that is now difficult to navigate or requires a lot more resource to function, wouldn't necessary translate to "improvement".