Puredata GUI unresponsive/slow with i3

Output of `i3 --moreversion 2>&- || i3 --version`:

$ i3 --moreversion 2>&- || i3 --version
Binary i3 version: 4.15 (2018-03-10) © 2009 Michael Stapelberg and contributors
Running i3 version: 4.15 (2018-03-10) (pid 26299) abort…)
Loaded i3 config: /home/fab/.config/i3/config (Last modified: mar. 08 mai 2018 15:45:27 CEST, 17372 seconds ago)

The i3 binary you just called: /usr/bin/i3
The i3 binary you are running: /usr/bin/i3

URL to a logfile as per https://i3wm.org/docs/debugging.html:

https://logs.i3wm.org/logs/5696910388101120.bz2

**What I did:**

* start Xorg with i3 in debug mode
* start puredata with default settings
* click Window menu, and Minimize (did it 3 times)
* quit puredata

**What I saw:**

The GUI becomes unresponsive with every "minimize" action, the window isn't instantly redrawn.

**What I expected instead:**

Nothing since i3 isn't meant to "minimize" windows, but GUI should stay reactive.

Similar symptoms occur when using puredata in a normal way, to a point it is not usable : this application is meant to work realtime since it's a platform for sound design/musical instrument, amongst other things.

The problem doesn't seem to occur with other environments (tested with openbox), this problem has been around for months/years if not always but I had a break from its use so I'm only reporting it now. Some other users seem to experiment the same problems with the same app ( https://www.reddit.com/r/i3wm/comments/6wyrsz/i3_does_not_work_well_with_puredata/ ).