Update
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.
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Cubase
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.
Reaper
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.
Versions
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.
My computer.
Do I have anything unusual taking up CPU?