I resolved the issue, which was due to a faulty battery on the Macbook Pro which didn’t hold any charge, once replaced, Helix Native runs smoothly.
At 1024 sample buffer size and one instance of the plugin, the CPU usage is at about 80% and audio drops out slightly. Two instances, or other plugins, lead to serious dropouts.
At 1024 buffer size and one instance of the plugin, the CPU at about 30 % load and it works unless I do something CPU intensive. Two instances makes use of 60% and the audio only plays well for a few seconds before starting to drop out.
Helix Native 1.81 demo, Cubase Pro 10.0.40, Reaper 5.983/64, Mac OS 10.14.6 (8GB RAM), RME Fireface 400 via thunderbolt adapter with firmware version 3.36 and Totalmix 1.60.
Do I have anything unusual taking up CPU?