Every system has a bottleneck.
If someone improved your on-ramp's performance by letting it handle twice the amount of traffic, you would undoubtedly think this was a good thing. In the computer world, server platforms are the equivalent of slow and problematic on-ramps. In computers, the throughput bottleneck moves around as technological advances in one area eclipse those in another. With early PCs, the hard disk was often the slowest component. As we connected to each other, the network became the slowest point.