I wanted to share this in case others have seen it. We're working with a particularly large rulebase and seeing constant spikes / "blips" in both CPU and memory usage, causing our machines to freeze up for a second or so (at regular intervals). We've experienced this across three laptops of different brands, and a virtual machine, using three versions of OPM (10.4.2, 10.4.4, and 10.4.5).
Maybe OPM is performing some kind of refresh / validation / update on the build model? If there is any workaround to improve performance, that would be great to know.