9-18 makes my GH2 SLOW
If you have to wait close to one minute, there is definitely something wrong. Does this happen only with that lens and there is nothing else changed when you change the lens? If it is, then more likely it is the lens.
I only have 14-140 for GH2 and I have never seen something like that happen with stills or motion capture. I plan not to buy any other lens for m43 as I don't see any use for them for the type of video I am doing.