IIRC, this was previously discussed on the mailing list (and bugzilla) and the
cairo library was identified as a culprit/accessory to the lag -- as some users
reported downgrading to a previous libcairo fixes the ruler lag.
However, it also appears to have been properly fixed as of mid-August:
Numbers may not lie, but neither do they tell the whole truth.
> From: jag.rabi...@gmail.com
> Date: Sun, 6 Sep 2015 14:16:26 -0300
> To: dra...@darkrefraction.com
> CC: firstname.lastname@example.org
> Subject: Re: [Gimp-developer] Brush + Paint Dynamic - performance problems
> and comparison between 2.9 and 2.8.14.
> Michael is necessary write a bug report?
> On Sat, Sep 5, 2015 at 3:30 PM, Americo Gobbo <jag.rabi...@gmail.com> wrote:
> > On Sat, Sep 5, 2015 at 2:55 PM, Michael Henning <dra...@darkrefraction.com
> > > wrote:
> >> Does this issue clear up if you disable the rulers (by unchecking View ->
> >> Show Rulers)? If so, it's probably my fault.
> > Yes, without rulers works fine!
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