In Reaper there’s a function (Performance Meter) which allows you to see which VST and how much they use CPU load and RAM.
In Cubase I found only Audio Performance which allows me to see results of the whole project, but not particular VSTs. I’ve got 70 instruments and I have to figure out which is the worst one to eliminate it…
Unfortunately this is not possible in Cubase. You can see Latency parameter in the Plug-in Information or you can see the whole Channel Latency in the MixConsole. But not the CPU load/RAM usage of every single plug-in.