Got bored recently and started messing around with Linux kernels. Ubuntu 20.04 still ships 5.4 by default, and even if you install the OEM kernel you’re only at 5.6 — meanwhile mainline is already at 5.9, which is pretty underwhelming if you like being on the newest thing. And some of the new features baked into recent kernels genuinely do improve performance. Canonical’s Daniel Van Vugt was recently digging into why gnome-shell performs so badly at 4K, and it turned out to be a kernel scheduling problem with Intel integrated graphics creating the bottleneck. That issue seems to be largely alleviated on 5.8.