[SOLVED] Gimp 2.8.6 on Slackware 14.1: functions like 'rotate' are unusably slow
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Gimp 2.8.6 on Slackware 14.1: functions like 'rotate' are unusably slow
Using Gimp-2.8.6 on Slackware 14.1, I'm seeing extreme slowness with Rotate and similar functions: Shear, Scale, and Perspective. With the defaults: Normal/Forward and Show image preview on, it is locking up for 15-30 seconds every time I try to do something (change rotation, even Cancel).
This is even for an empty, small (1024x768) image. That is: File > New, select 1024x768 template, OK; click on Rotate tool, click inside the canvas ... no reply for 15-30 seconds. Same thing on Gimp-2.8.2 with Slackware 14.0 is instantaneous.
During the delays, the X server is using 100% of one core, and Gimp is using 25% of another. I'm seeing similar slowness on another PC with single core and different graphics.
Thanks very much to both of you. I rebuilt cairo-1.12.14 using the cairo.SlackBuild after removing the --enable-xlib-xcb option (which by the way occurs 3 times, not 2, in the script! Once enabled, once commented out saying it isn't 'stable', and a third time commented out with "Not sure if these two are needed / useful yet."
The commands in Gimp now work very well.
Hopefully this fix will make it into cairo.SlackBuild when it is next upgraded, patched, or rebuilt.
Followup: Slackware 14.1 patch was released today: cairo-1.12.16-i486-1_slack14.1
The patch includes changes to fix the problem above.
(This is not a security patch, so if won't be announced on slackware-security.)