So I'm less sure it's DeskScapes. But it's still something Stardock. Here's why.
When I ran powercfg -energy, Windows pointed a finger at Explorer, DeskScapes, Groupy... In fact, it blamed Rainmeter too (for lowering the platform timer resolution).
I removed DeskScapes and WindowBlinds.
Windows no longer said anything about Groupy. Or Rainmeter.
Stripped of WindowBlinds, the platform timer resolution stays where Windows wants it. I suspect that anything which interacts with Explorer is then hooked into WindowBlind's desire to lower the timer resolution even if that application doesn't do so on its own.
Now, I understand WindowBlinds is a UI customizer, so there may be valid reasons for it to insist on hammering the CPU. But for my laptop, which I bought for the allegedly epic battery life, I settled for a different way of getting transparency back that doesn't show up on Windows energy reports.