In this blog, we offer a concise analysis of Trillium's performance, demonstrating why it stands out as the most performant TPU training system to date. We begin with a quick overview of system comparison metrics, starting with traditional scaling efficiency. We introduce convergence scaling efficiency as a crucial metric to consider in addition to scaling efficiency. We assess these two metrics along with performance per dollar and present a comparative view of Trillium against Cloud TPU v5p. We conclude with guidance that you can use to make an informed choice for your cloud accelerators.