I liked virtualenvwrapper, but it added considerable (noticable) latency to my terminal startups. I ended up removing it and went back to manual virtualenv activation (with a couple of small helper bash functions of course).
Same here. At times, it gets so bad that I have to hit Ctrl+C and then it dumps out a nice big trace before giving me my shell prompt.
I have never seen that. it just loads a script into path. interesting.