Autocompletion and Code analysis issues after switching to PyCharm Profesional

Hello,

I've recently updated from PyCharm Community Edition to Professional and I'm encountering very severe performance and usability issues with code completion and code analysis generally. Maybe the issues are not tight to Pro edition, but I don't remember having them prior to update. I've already tried to invalidate all caches etc, but nothing helped. 

Here is what I'm experiencing

• when defining member variables inside __init__ method, autocomplete is not finding them for further coding in the __init__ method. It only shows other methods in class and local variables. (sometimes it works, but I failed to find a pattern)
• code analysis is very slow. Often underscores some peace of code, and after correction it takes approx 10-20 seconds to correct code-analysis result
• maybe related to previous. When trying to use sell checking, with two misspelled words on one line, fixing second word has issues with proper selection, when the word position changed after firs word correction. It is hard to explain, so please see this video : https://www.youtube.com/watch?v=7kdJ9_Rmmfw and notice how selection on second word changes after spawning spellcheck drop-down and corrected word is placed wrongly into the text.

This issues are sometimes very frustrating and I do my best to try help you to track it down and solve it.