It takes too a long time for Tor Browser to close and be ready for a next start

Operating System: Ubuntu 18.04 64bit Tor Browser ver: 9.0.5 64bit

When closing Tor Browser i have to wait about 70 seconds for it to close completely. For instance, when i start the browser and do nothing (but leave it on the initial page "about tor") and then close it, it takes a while for processes "-childID 1" and "-childID 2" to close, but the process "-childID 3" (or, in the case of surfing, usually the last in number) as well as "Firefox" remain in the background of processes for nearly 70 seconds (or 1 minute and 10 seconds) - in that time the process "Firefox" is working intensively taking most of the processor resource (over 98%) (i.e. for all that time - about 70 seconds - until it is completely closed).

It is impossible to start the browser during those 70 seconds (you know the message "Tor Browser is already running, but is not responding. To open a new window, you must first close the existing Tor Browser process, or restart your system.")

Trac:
Username: JKLjkl

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information