I often have about 30 or 40 tabs, waiting for attention. My Win-11 UI was borderline unresponsive, Zen needed as many as five seconds to pause a YouTube post, clicking on the pause button was a little more responsive, but still a couple of seconds from click to action. My cursor disappeared over the Zen window, ... (meaning Zen was very busy doing other stuff) even though I still had about half of CPU available (on a 16 'thread' Core-i9 processor) with 128GB of RAM. Closing Zen and restarting (reloading all of the previous tabs) got the CPU utilization down to 11%, so I suspect there were zombie threads dragging the machine down. I think that deserves investigation.
