Indeed, the /// is a good indicator of VST3, but you can also get 32bit VST3 plugs. I’m looking for 64-bit only plugs to see if my frankly awful performance drop is due to a compatibility issue with a 32bit plug.
Maybe you can use the VST Performance Meter to assist with your investigation?
To access it go to devices>VST Performance (F12). I never used this meter and some say it’s worth is questionable but… can’t hurt to check it out.
Forum userhttps://www.steinberg.net/forums/memberlist.php?mode=viewprofile&u=20343 UltimateOutsider has this great tool “ultimate plugin tool” which tidies up installation directories, plus your plugin library and kontakt folders.