Autocomplete is slow for some python modules, for example for numpy:
https://www.youtube.com/watch?v=gcAjEElSUCc
It usually takes a second or two for autocomplete to start showing possible autocomplete options. I set autopopup delay to 0 ms, but this did not help.
I use Ubuntu 15.10. I have 8 core AMD processor and 32 gb of ram. Same autocompletion in LiClipse on my machine is instantaneous.
I usually use heavily autocomplete, thus for me speed matters. I would greatly appreciate if someone would help me to make autocomplete faster or to let me know that it is not possible.