The new notification timer that counts down until the notification expires causes roughly 15% CPU utilization on my dual core Intel Core i5 Kaby Lake processor. The constantly moving timer also makes notifications more distracting. I would prefer improved battery life and less distracting notifications over having the timer. At the least, I would like to see an option to disable the timer.
*** Bug 513336 has been marked as a duplicate of this bug. ***
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/6114