One instance almost kills my aging machine. Average load can go from 30% to over 90% when I switch it on. So I just don't use it, when I have other less CPU tape machines. If I do use it in the future, it will be offline processed.
Back on topic.
PSP buss processor
PSP Vintage Warmer 2
are my stock mix bus plugins. (along with Arc and Reference 4 and Waves WLM Plus)