Gnome Wayland session got very slow and then crashed

Gnome Shell 3.28.3 on Arch Linux.

Shell crashed a few (~3) minutes after it became very slow.

#0  0x00007f744729a25f in raise () at /usr/lib/libpthread.so.0
#1  0x000055dc43de79b2 in dump_gjs_stack_on_signal_handler (signo=5) at ../gnome-shell/src/main.c:367
#2  0x00007f744729a3c0 in <signal handler called> () at /usr/lib/libpthread.so.0
#3  0x00007f74465c1ed2 in  () at /usr/lib/libglib-2.0.so.0
#4  0x00007f74465c4909 in g_log_writer_default () at /usr/lib/libglib-2.0.so.0
#5  0x00007f74465c2ab2 in g_log_structured_array () at /usr/lib/libglib-2.0.so.0
#6  0x00007f74465c3550 in g_log_structured_standard () at /usr/lib/libglib-2.0.so.0
#7  0x00007f7444715a2e in _gdk_x11_display_error_event (display=display@entry=0x55dc45a37000, error=error@entry=0x7ffd1887ec40) at gdkdisplay-x11.c:2766
#8  0x00007f7444722b65 in gdk_x_error (xdisplay=0x55dc45a25710, error=0x7ffd1887ec40)
    at gdkmain-x11.c:307
#9  0x00007f7443bc26ed in _XError () at /usr/lib/libX11.so.6
#10 0x00007f7443bbf617 in  () at /usr/lib/libX11.so.6
#11 0x00007f7443bbf6d5 in  () at /usr/lib/libX11.so.6
#12 0x00007f7443bbffd5 in _XEventsQueued () at /usr/lib/libX11.so.6
#13 0x00007f7443bb1ca7 in XPending () at /usr/lib/libX11.so.6
#14 0x00007f744471d087 in gdk_check_xpending (display=0x55dc45a37000) at gdkeventsource.c:269
#15 0x00007f744471d087 in gdk_event_source_prepare (source=<optimized out>, timeout=<optimized out>)
    at gdkeventsource.c:287
#16 0x00007f74465bba49 in g_main_context_prepare () at /usr/lib/libglib-2.0.so.0
#17 0x00007f74465bc44e in  () at /usr/lib/libglib-2.0.so.0
#18 0x00007f74465bc8e2 in g_main_loop_run () at /usr/lib/libglib-2.0.so.0
#19 0x00007f7444aac990 in meta_run () at /usr/lib/libmutter-2.so.0
#20 0x000055dc43de743d in main (argc=<optimized out>, argv=<optimized out>)
---Type <return> to continue, or q <return> to quit---
    at ../gnome-shell/src/main.c:525