3rd party plugins running poorly

When I use logic pro all my 3rd party plugins run quickly but when I use audacity it takes a long time and it’s unusable like this. I have the izotope bundle and even when I just use nectar 3 it takes 5 to 10 minutes. Doesn’t make any sense. I went into the settings and increaded the buffer size but it just made it worse. Any ideas on how to fix this? Tnx!

From the izotope site (https://www.izotope.com/en/products/vocal-doubler/system-requirements.html)

Supported Hosts:

Logic Pro X, Ableton Live 9–10, Pro Tools 11)–2018, Cubase 9–5, Nuendo 8, FL Studio 12, Studio One 3–4, Reason 10, Reaper 5, Audition CC 2018, Premiere Pro CC 2018, Digital Performer 9

Big Sur

So it’s running poorly because they don’t officially support it?

I’d say that you’re lucky that it works at all considering Audacity is not a supported host application.