What seems to have worked for me is changing 32 bit floating to 64 bit floating; haven’t had any reel spikes anymore in the last hour or so, even with multithreading and suspend vst 3 all enabled.
ah i also switched to 64bit, but I saw no change. I was still spiking with just 1 vst and 1 audio track with helix native active. The issue seems fairly random for me. I can have one project that works ok-ish from start to finish. Then if I start a new project I can get spikes immediately.
Since it is so random Steinberg may not know what’s causing the issue. If they can’t recreate the problem on their end then it’ll be hard for them to debug.