Turning Off/Altering Eclipse Prediction

When coding Java in Eclipse, it often tries to predict what you're typing. For instance in GWT's UiBinder, I just tried <g:Rad and then it took around 15 seconds for it to often me 'RadioButton' whilst not allowing me t开发者_StackOverflow中文版o type the bloody thing in. Whilst it's an extremely useful thing, my system is mobile and isn't particularly fast, therefore I'd rather explicity do a ctrl + space to ask Eclipse to offer me what I might want.

Is this possible?

In Window->Preferences->Java->Editor->Content assist you can uncheck the Enable Auto-Activation there, or reduce the time to 0ms so it assists you immediately