[Libreoffice-bugs] [Bug 122884] New: Performance: GTK3 VCL Slow Using NX Xserver

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=122884

            Bug ID: 122884
           Summary: Performance: GTK3 VCL Slow Using NX Xserver
           Product: LibreOffice
           Version: 6.2.0.0.beta1+
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: graphics stack
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: drichard at largo.com

Created attachment 148527
  --> https://bugs.documentfoundation.org/attachment.cgi?id=148527&action=edit
Valgrind of a session running over NX technology.

In testing version 6.2, it was noticed there was a big performance issue at
cold start.  6.1 is opening in about 2 seconds, and 6.2 takes about 5-6 seconds
before it's fully rendered.

If the VCL is changed from default GTK3 back to GTK2, it immediately gets much
faster.  

We have many other GTK3 apps running and are not seeing any performance issues
this badly.

LibreOffice is being run from large multi-user servers using the NX Xserver. 
Your larger enterprise customers may have similar issues as they move this
version live.   This technique is similar to using VNC to run an Xserver, and
it's possible the performance issue would be seen using this software as well.

In the past, when these types of things happen, the local video card of the
computer is compensating for the issue so it's not noticed.  

When LO opens, the initial canvas appears and then slowly the icons and
pulldown menus appear when in GTK 3.

I did a valgrind and will attach.  Not sure what else I can do to help.

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