Jedi in Vim, PyCharm/IntelliJ, and whatever tool VSCode uses (which I think is Jedi).

Same experience everywhere. Once I type "tf" - a hang for multiple seconds, presumably while it loads the entire Tensorflow library. The completion then works smoothly, until I hit space or otherwise exit the completion.

Once I type "tf" again, the cycle repeats, and I have to wait multiple seconds.

You'd think the tool might cache libraries instead of reloading them every time. Seems like it doesn't at all.