It is a rare case that we cannot speed up your website, especially if you come to us with a page load time in excess of two seconds (with the higher the number meaning we have more and more room to help you out).
However, it does happen on occasion that we cannot make any meaningful budge in your page load speed, no matter how hard we try ("meaningful" meaning , at minimum, in excess of a 10% increase in load speed).
Usually these scenarios pop up when hosting the website on a very low-cost, budget host, which constricts our ability to move the needle much (we can assist in helping you switch hosts if needed, at an hourly rate—just let us know). Other reasons for this can include too many plugins (we've seen sites in excess of 50+ plugins operating at the same time), or a poorly configured/broken server (if running on a self-managed VPS system, or in a Windows hosting environment).
In case we are unable to sufficiently increase your site load time, we offer a Money-Back Guarantee where we will refund you in full after notifying you of options available (if applicable), and you choosing to not proceed any further.