I've just compared version 1.1 and version 2.3 with copy and paste. Version 1.1 took 2 seconds to paste and version 2.3 took 6 seconds. I find the object move and rotate functions similarly slow in version 2.3. With 10 or more objects on the platform, the manual object move and rotate commands are so slow I can't use them. I have to use auto orientate. Maybe this is something that is just affecting me.
Having said this, I so like the rest of the enhancements I can't image I'll ever go back to version 1.
I think this might be just a you issue. I haven't had any of the issues you seem to be having.