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bug#21028: Performance regression in revision af1a69f4d17a482c359d98c00e

From: Eli Zaretskii
Subject: bug#21028: Performance regression in revision af1a69f4d17a482c359d98c00ef86fac835b5fac (Apr 2014).
Date: Thu, 27 Oct 2016 18:55:11 +0300

> Cc: address@hidden
> From: Clément Pit--Claudel <address@hidden>
> Date: Thu, 27 Oct 2016 11:29:45 -0400
> * Started from a clean checkout
> * Reverted af1a69f4d17a482c359d98c00ef86fac835b5fac
> * Applied the patch below
> And indeed:
> * Performance is great (bug #21028 is gone)
> * I don't observe segfaults anymore (I can't reproduce bug #24790)
> > So put back that part of the changeset, and if your performance
> > problems are still solved by the rest, we might just revert the other
> > part on master, because no one seems to be able to reproduce the
> > problem with empty vectors in the font cache, which that part was
> > supposed to fix.
> That would be great.

Come back in a month or two, and if there are no new issues, I will do

Did you try the recipe described in


?  I tried, but couldn't see any errors, but I don't have a 7x13 font
on my system, so maybe the problem doesn't get trigger.

That's the only reason the other part of the patch was introduced, and
if it's no longer pertinent, we could go back.

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