[Libreoffice-bugs] [Bug 126344] New: Undo is slower and consumes more CPU time after pressing undo (compared to 4.4.7.2)

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=126344

            Bug ID: 126344
           Summary: Undo is slower and consumes more CPU time after
                    pressing undo (compared to 4.4.7.2)
           Product: LibreOffice
           Version: 6.4.0.0.alpha0+ Master
          Hardware: All
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: telesto at surfxs.nl

Description:
Undo is slower and consumes more CPU time after pressing undo (compared to
4.4.7.2)

Steps to Reproduce:
1. Open attachment 140185
2. Press F5
3. Go to page 200
4. Set cursor at the beginning of pag 200
5. Press Shift & scroll to the bottom and select the end of the sentence (ergo
select everything from pag 200 until end)
6. Press Delete (wait until the CPU usage is down to nearly zero)
7. Press Undo (CTRL+Z



Actual Results:
30 seconds CPU spike after press undo. It's slower and more CPU hogging

Expected Results:
12 seconds spike in LibO 4.4.7.2 (comparison is bit off.. scheduling has
changed.. everything is processed on 'high priority'.. previously the
scheduling had more of idle way of doing things.. but it's to slow for sure..
Maybe large paragraphs issue


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 6.4.0.0.alpha0+ (x86)
Build ID: 2f2f4767089512c34514896bc37823f9310e9dd4
CPU threads: 4; OS: Windows 6.3; UI render: default; VCL: win; 
TinderBox: Win-x86 at 42, Branch:master, Time: 2019-07-10_00:49:53
Locale: nl-NL (nl_NL); UI-Language: en-US
Calc: CL

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