Certain applications and hardware types -- emerging memory, artificial intelligence/machine learning, and cloud servers, to name a few -- can realize significant performance advantages when a low latency interface is employed. The CXL (Compute Express Link™) standard was developed specifically as a low latency offshoot of the ever-popular PCIeTM (PCI ExpressTM), and is finding its footing in many of the applications listed.
Let’s compare typical latency of existing standards first. Data shown below is gathered from a variety of industry sources: