Does using proguard makes the android app running slower?

I developed an app and obfuscated it with proguard. However it worked, but it seems the application now run slower than the previous before obfuscation.开发者_StackOverflow Need help !!

Especially on Android's Dalvik VM, processed applications should be faster. If you have a simple example that runs more slowly, you can mail it to me and I'll look into it (ProGuard feedback page).