Description: Stuttering/ judder while scrolling using page down. A recycled bug-doc.. can't find the source bug Steps to Reproduce: 1. Open attached file 2. Press Page down & monitor CPU Actual Results: Stuttering/ slow down Expected Results: Smooth scroll Reproducible: Always User Profile Reset: No Additional Info: Version: 6.3.0.0.alpha0+ Build ID: 6740443311268b7d918bf4f43134d64fb78a0109 CPU threads: 4; OS: Windows 6.3; UI render: GL; VCL: win; TinderBox: Win-x86@42, Branch:master, Time: 2019-01-15_23:37:04 Locale: nl-NL (nl_NL); UI-Language: en-US Calc: CL And with Version: 5.4.1.0.0+ Build ID: f200d5700782ae179fd96b6ad4b0fe8e7edd1616 CPU threads: 4; OS: Windows 6.29; UI render: default; Locale: nl-NL (nl_NL); Calc: CL
Created attachment 148657 [details] Example file
When I try to open the file, LO becomes unresponsive. Version: 6.3.0.0.alpha0+ Build ID: 3c964980da07892a02d5ac721d80558c459532d0 CPU threads: 2; OS: Windows 6.1; UI render: default; VCL: win; TinderBox: Win-x86@42, Branch:master, Time: 2018-12-12_02:07:45 Locale: en-US (en_US); UI-Language: en-US Calc: threaded
I found the most informative metric is to hold page down for 10 seconds, stop, observe the page you reached. With 4.3.0 I reached page 100. With 5.0.2 I reached 50. With 6.0 bibisect repo I reached 19 (same ballpark for newer ones). Unfortunately, I did not get the worst value in the bibisect repo for 5.4, so I am unable to perform a bibisect. Maybe I could try to find the worsening after 4.3 on Linux.
(In reply to Buovjaga from comment #3) > Maybe I could try to find the worsening after 4.3 on Linux. No luck. I was not able to observe a difference. Linux behaves differently from Windows in that it keeps scrolling a long time after you finish pressing PgDn.
Repro with Version: 6.5.0.0.alpha0+ (x64) Build ID: ce685f64f38551e7984155783c9c7660d986abf6 CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: GL; VCL: win; Locale: nl-NL (nl_NL); UI-Language: en-US Calc: CL A flamegraph would be nice
Created attachment 157088 [details] Flamegraph Here's a Flamegraph retrieved on pc Debian x86-64 with master sources updated today. (I waited some seconds before killing perf trace).