I have found many tweaks that I really want in this question (remove delay, show without specific combinations, just like Visual Studio): Is it possible to make the auto-complete in netbeans not depend on a key-combination?
However, in Netbeans 7.3.1, I found no Advanced Options, and I tried to type 'delay' in the search box, still no thing popped out. In a comment section, I found the solution to pop out the code completion without having to type something. But it still have delay, and it greatly reduces my coding speed compare to Eclipse.
Can you tell me where can I remove the delay in Netbeans 7.3.1?