In the link you cite you said in December,
"After rm konsolerc issue somehow resolved. Magic."
Are you saying you're having the problem again?
It began to eat memory more slowly. But I had some other offtopic
business that time. And now I want to continue.
FWIW, after an update I did a reboot and konsole has been running since then with 3 open
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
22764 egreshko 20 0 662960 22780 16056 S 1.0 0.3 6:36.20 konsole
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
7045 krege 20 0 6014104 5,121g 69588 S 10,7 16,3 76:22.82 konsole
with about 11-12 tabs.