Performance budget is an excellent way to ensure performance remains part of the project. However, as we discussed earlier, the budget must be defined as soon as possible. If you are half way through a project without a performance budget, you will have a difficult time to convince the stakeholders or top management. Also, by then, there may already be approved designs or features that immediately crush whatever budget you may have needed to set.
Another important thing is that when you define the budget, and as you enforce it, you should already know what content needs to be on the page. When you allocate a performance budget to your project, it should help you to decide how to display your content, rather than not what content to display. Removing content from your page is not a strategy of performance.