Brave's shields against ad & tracking inserts seem to help against many of the cycle-stealers that affect standard Chrome… except for the occasional times where

Brave's shields against ad & tracking inserts seem to help against many of the cycle-stealers that affect standard Chrome… except for the occasional times where they perhaps trigger cycle-consumptive bugs by breaking assumptions of remaining JS. I'd really prefer a browser to give a good estimate of an individual tab's perceptible load/contribution-to-lag – via some blended measure of CPU/interrupts/wakes/events – and give me a ranked, stable view of offenders, with an easy kill/reload/'nice' control. The Chrome et al 'Task Manager' has only scraps of what's needed - with its noisy, jumpy process-centric view that hides obscures the load of individual tabs, offers only process kills rather than per-tab management, and often foregrounds internal processes that the user can hardly do anything about (or map to the truly-responsible web content).