Saying it properly is far more important than saying it quickly.

It is good to speak not to quick and not to slow what I think.. But you should talk in that speed who you like and feel comfortable in. Are you insecure it is better to talk slowly what I think.

depends. 1. if you are not native and make mistakes while trying to be fast, then speak slow. Slow and correct is better than fast and wrong. 2. if the listener isnt native, then again consider him/her and speak slow and proper so he can get you. After all isnt that why we speak? To convey our message? but, if you can speak fast and correct and the listener can understand you too, then no harm in speaking fast.

Slow. Give yourself time to think and others time to absorb.

the purpose of learning any language is to make understand those language people,and if we will talk speedly then it will hard to understand for them,and bcz our accent also can problem some time,so its better to speak slow and cleraly (specially in biggings,and after getting hold on that language our speed will increase automaticaly :)