Interesting. I'm sure heat and battery life are noticeably affected. If not very noticeably, I think significantly anyhow I recently got some Galaxy Note 10" 2014 units, and I am trying to get the very best out of it. I hadn't even known about them. The early Galaxy Note phones were terrific, but still a phone size. Then there are the Galaxy Tab models which basically deals with the size issue but not really designed specifically for what I wanted. This thing is just a very enlarged Note 4. On a couple of them, I put TWRP and custom ROM, while on one of them I kept the stock ROM with its last update, bringing it to Android 5.x. It runs the old school Adobe PS Touch, Snapseed, Sketchbook, S-Note, and a handful of other graphics apps. They all run beautifully and it's my almost-perfect art device. Rooted and debloated, of course. I'm gonna see how these modified units do on eBay.

I think my long-winded rambling point is that rather than kill your battery and possibly cause severe wear on your device, maybe find one that can use a custom ROM, or at least Root and optimizing by shutting off tons of bloat.

What's your use case for doing this.

Not on stock ROM. IIRC back when I was messing with that kind of thing, you needed a custom kernel.

Usually (on laptops anyway) setting the performance governor only marginally increases throughput and/or latency, while significantly increasing power use. This is because the default behavior of ondemand governor is, almost always, to go to max clock speed practically instantly when there's actual work to do.

In theory it can even have detrimental effect, especially with passive/inadequate cooling (which I assume an Android tablet would have), because the CPU will throttle automatically if it gets too warm, and disabling power saving features means it'll run generally hotter.

I'm surprised that worked since Termux has so many permissions and process # limits and stuff on stock Android. Is it permanent? Semi-permanent if you avoid losing ADB/Shizuku with restart?

You simply disabled the power management.

Thanks, i'll try this on my anemic E-reader (Kobo Boox Leaf). It's a bit painful to run, barely fast enough to not timeout Kotatsu (Manga).

But needs to be done each reboot.