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I have mostly good news to report. I modified my app to dynamically generate both set of grammars as you suggested with Rejecto, and set the weight parameter of both to nil, with the latest beta dist. So far, the CPU utilization has been under controlled. Sometimes it went up high but would drop very quickly. I am happy to report there is no noticeable performance impact with this solution, and hypothesis does not contain rejected words either. I am curious as why rejected words are delivered when using pre-generated grammar. I do not need to pre-create grammars at this time but if its number increases, we may need to reconsider it in the future.
Another observation is weight. Rejecto still delivers too many out-of-vocabulary words. I tried to set weight to 1.3, 1, 0.8, 0.5 and 0. In every scenario, the CPU spike re-appears. It seems only nil will allow the framework to function properly.
If I can’t use weight, is there other method allowing tuning of the Rejecto behavior? Thanks