The efficiency would probably depend on how complex the patch is. I already use The Grid for custom modulators, and it definitely can get high on the cpu if there are a lot of connections. However, The Grid does oversampling which wouldn’t really be needed in this, because it isn’t intended for audio. So, they could have oversampling off on this. Also, if we get Containers in The Grid, I think that will help with simplifying and reducing cpu usage on complex patches.
Ideally, we would get a bunch of panel modules ( just like I hope we get with Containers in The Grid, so we wouldn’t even need to open The Grid to use this “Grid Modulator” I think that would also help with CPU for this, because, like I mentioned on the Containers in The Grid thread, I have noticed that large Grid Patches use a lot more CPU when their window is open, than when only audio is running. So, I assume that processing the visual graphics effects the CPU. So, being able to just have the necesarry parameters showing on the new modulator would hopefully use less CPU than having to open The Grid patch.