Yeah it is slow for instance.
I thought it was my Activator gesture causing this but I believe it must be the time it takes just loading all the apps in the list page (experienced this in AppsCenter for Notification Center), or the process of blurring up the background image (as Blurried NC does).
I bought this tweak to try out its 'better OSX-like task-switching' and I admittedly prefer the native multitask switcher brought up by pulling the bottom of the screen, through Activator again.
Imperium has a toggles page, but again I use OmniStat (free) which has a great toggle interface you bring up in the notification center drop down window. It has a kill all running apps button as well, making this Imperium feature unnecessary for me.
ListLauncher is unmatched yet. I miss it too. 🙁