https://bugs.documentfoundation.org/show_bug.cgi?id=146095

--- Comment #1 from Telesto <[email protected]> ---
Created attachment 176763
  --> https://bugs.documentfoundation.org/attachment.cgi?id=176763&action=edit
Bibisect log

Initial slowdown started with
author  Luboš Luňák <[email protected]>     2020-09-05 07:05:16 +0200
committer       Luboš Luňák <[email protected]>     2020-09-07 15:19:32
+0200
commit  717ce6838b7ef0add1f9a9655e2b8c0bf60203f0 (patch)
tree    0b887e4a06120dea3fff1788a337365d427441e8
parent  23762a704133051184850fc711e44bc9a112f59a (diff)
avoid temporary SkImage when merging bitmaps in Skia (tdf#136244)
The original idea was to create a temporary SkImage in order to first
merge the bitmap and its alpha bitmap, otherwise scaling already
while merging them could introduce artefacts because of smoothscaling
the alpha. But SkShader use blends the bitmap and alpha values
before the scaling, so this is actually not necessary.

There might be a second commit making this even worse.. it's really really bad
in 7.3

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