I have 6 level mainteiners, mostly filled with levels:

They causing continuous CPU load (about 3% of tick time), even if idle (no new crafting tasks adding). It can be seeing through Lag Goggles mod and Sampler.
There is screenshot of Sampler's snapshot:

Is it expected load for this device?
How I can reduce CPU load by using Level Maintainer?

it shouldn't be doing that unless there's actually something out of stock. that being said, there should probably be more aggressive backoff when a crafting job fails.

Would be cool! I wish network parts that actually do nothing do not consume CPU.