[Libreoffice-bugs] [Bug 131408] New: calc: ui: remarkable slowdowns for scrolling in ver. 7.0

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=131408

            Bug ID: 131408
           Summary: calc: ui: remarkable slowdowns for scrolling in ver.
                    7.0
           Product: LibreOffice
           Version: 7.0.0.0.alpha0+ Master
          Hardware: All
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: newbie-02 at gmx.de

Description:
scrolling down a column pressing <pg-down> with pressed <shift> key
simultaneously to mark a range, has far different performance in different
versions: 

6.2.8.2:         ~30.000 rows in about 20 sec., 

7.0.0.0.a0+: only ~8.000 rows in the same time, 

imho a remarkeable regression / loss of performance ... 

6.2.8.2 looks having better ui-performance in plenty respects, e.g. also
handling of comments, which didn't make it into subsequent versions ... :-(

Steps to Reproduce:
1. get a stopwatch at hand, 
2. meter your mileage marking a big range on a sheet, 
3. repeat with different versions of LO,
4. include ver. 6.2.8.2 winx64, 
5. compare results, 

Actual Results:
slow ui performance in ver. 7.0.0.0.a0+

Expected Results:
performance in fresh versions as good as in older ver. or better, 


Reproducible: Always


User Profile Reset: No



Additional Info:
ver. compared by me: 

fast: 
Version: 6.2.8.2 (x64)
Build ID: f82ddfca21ebc1e222a662a32b25c0c9d20169ee
CPU threads: 8; OS: Windows 6.1; UI render: default; VCL: win; 
Locale: de-DE (de_DE); UI-Language: en-US
Calc: 

slow: 
Version: 7.0.0.0.alpha0+ (x64)
Build ID: 6ac2d66c78d6c080aabfa46157113684c2f3a3b0
CPU threads: 8; OS: Windows 6.1 Service Pack 1 Build 7601; UI render:
Skia/Raster; VCL: win; 
Locale: de-DE (de_DE); UI-Language: en-US
Calc:

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