[Scummvm-tracker] [ScummVM :: Bugs] #13153: SCI Games begin lagging either at launch or after moving about outside of window

[ScummVM :: Bugs]

#13153: SCI Games begin lagging either at launch or after moving about outside of
window
---------------------------+--------------------------------
Reporter:  NikkiPhoenix80  |       Owner:  (none)
    Type:  defect          |      Status:  new
Priority:  normal          |   Component:  Engine: SCI
 Version:                  |  Resolution:
Keywords:                  |        Game:  Quest for Glory 1
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Comment (by shdon):

 I was on a troubleshooting session with Nikki after she encountered this
 (and am the one who recommended that she file this as a bug). Although I
 didn't experience it myself even when I updated my own ScummVM's
 installation to match her settings, I did witness it on her PC when she
 shared the desktop. The effect was real and quite pronounced.

 Some pertinent information:

 * it happened only with SCI games and did so with all of the ones we tried
 * games tested with AGI (SQ2) and SCUMM (MI3) showed no issues
 * reboot had no effect
 * repair install of ScummVM had no effect
 * changing sound drivers or even disabling sound altogether had no effect
 (we checked this because there was apparently some audio distortion,
 though I couldn't hear that through the desktop sharing)
 * switching graphics modes had no effect
 * the delay was not immediate. When starting the games, they would work
 fine. The delay only got introduced when doing something outside of the
 ScummVM viewport (like alt-tabbing out, clicking on another window, or
 even just moving/resizing the ScummVM viewport window). The more "mucking
 about outside ScummVM" there was, the longer the delay was. Maybe just one
 or two seconds at first, but could easily end up being half a minute.
 * Nikki would click somewhere to make the character walk there and it
 wouldn't start walking for several seconds, but the walking animation
 itself would play at normal speed
 * the same with pressing a cursor key to walk... several seconds before
 the game registered the input
 * Nikki would right-click on an object to get the description (QfG1 uses
 right-click to look-at) and there too, the dialog box would pop up after
 several seconds.

 The odd thing is that, just 2 days prior, there were no issues at all with
 the very same settings and installation. And also that I couldn't
 reproduce it on my machine even as I was watching it happen on hers. The
 downgrade from 2.5 to 2.2 at least made the games playable again, but
 obviously isn't a very satisfactory workaround or diagnosis. As far as
 Nikki knows, the only changes to the system configuration around that time
 may have been the .NET framework being updated to a more recent version,
 though that probably isn't related - just mentioning it for completeness.
-- 
Ticket URL: <https://bugs.scummvm.org/ticket/13153#comment:2>
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