[qubes-users] tribler blocks/disables sys-firewall ?

Hi, I made a small test-vm running only tribler (see
https://www.tribler.org/ for this software). It seems to slow down
sys-firewall so drastcally (example: ping from sys-net 16ms,
from sys-firewall > 4000ms) that de-facto all internet traffic is
blocked. I experimentally short-circuited the firewall (unsafely using
directly sys-net as tribler-netvm), and all is fine. When I switch back,
it blocks again. This clearly shows that both, tribler and sys-firewall
generate problems. Any ideas / help how to bugfix this ?? Cheers