Which dramatically speeds up switching between sheets in
the referenced document.
The problem here is that we have a timer for each buffered primitive.
And we have a lot of primitives here.
And the TimerManager does not scale well to lots and lots of timer,
because it uses a linked list.
So this change modifies the flushing mechanism, trading off some
precision for some speed.
Change-Id: I66a744f06af9b08d4e9b797d11db8d22f4060789
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/182876
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Noel Grandin
8a17b7f0a6