Opening/closing times using "Without Frame tags" attached file from
bug report changed as follows on my system (debug build):

open: 2:06 -> 1:32
close (doc unchanged): 1:52 -> 0:18

The performance fixes in the different CXX files are independent,
eventattachermgr.cxx is related to doc close, the others to doc open.

Change-Id: I24fc4558f79b9123494a3939c0a313fcd47a067f
Reviewed-on: https://gerrit.libreoffice.org/24359Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>