I am looking for suggestions to convert "low-complexity" (in the context of computations or a program) into a simple, short idiomatic word or adjective (not "simple"). [EDIT] It is meant to be used in several places, and I would like to avoid repetitions with very close-by terms.
Example is use : "the polynomial predictor is of low-complexity" > "the polynomial predictor is " or [EDIT] "this  approach".
[EDIT] The more precise context is that of online or "real-time" computing. A task, or part of a program, should be executed in a limited amount of time. The trade-off is: do it as good as possible, possibly complex, at the cost of other tasks that should be executed during the same period. Or at the risk that the aforementioned task cannot complete in the given amount of time. Here, low-complexity entails that the number of basic operations for the task is evaluated (somehow "bounded") and known to be able to complete.
"Low-complexity" does not mean no complexity at all. There is some, but quite tractable with little pain. Like "low-rate" does not stand for "free".
[EDIT] I thought about "scarce", or "tight", and am not unsure they apply in the context. "Efficiency" is good, it possibly does not convey the same direct "impact" to the technical reader.
[EDIT] I finally choosed a vaguer "hasty", with the acronym CHOP for "Computationally Hasty Online Prediction", which gracefully appeared before looking for the helicopter sound.