Comment # 9 on bug 81239 from Paul Menzel

I think I hit the same problem again today with Evolution 3.12.5, GTK+
3.12.2-3+b1 and xserver-xorg-video-radeon 1:7.4.0-2.

$ sudo perf top
[…]
  7,22%  libglib-2.0.so.0.4000.0        [.] g_main_context_prepare
  5,71%  libglib-2.0.so.0.4000.0        [.] 0x00090a0c
  4,84%  libglib-2.0.so.0.4000.0        [.] g_main_context_check
[…]