Painfully slow on iPhone 5s

I appreciate the long-needed MMS support and conversation view. However its so painfully slow on my iPhone 5s. Having to wait 3-5 seconds to switch between text messages and voicemails is unacceptable.

Edit: the latest update seems to be much faster. I will update my review after I have some more time with it.

dshepd about Google Voice, v2.6