Tor-browser and Trace Remains

I came across an interesting recommendation for using the Tor browser on one forum:

By the way, it is worth unpacking the browser again each time before using it, and deleting it immediately afterwards. You can automate this with a .desktop file, and unpack in tmpfs, which will speed up the browser, save drive resources, and get rid of residual traces. It is also worth isolating the browser via apparmor/firejail.

I have some questions:

  1. Are there really any residual traces after the session? If so, what kind of traces?

  2. How much faster is the browser in tmpfs compared to SSD/HDD?

  3. How to automate deletion and unpacking of browser via .desktop file to work in tmpfs?

  4. Will the apparmor profile need to be edited?