Created attachment 180176 [details] DOC file 1 This file opens a few minutes under Linux and a few seconds under windows
Created attachment 180177 [details] DOC file 2
Confirm in 7.4 with vcl:kf5
Created attachment 180178 [details] DOC file 1
Created attachment 180179 [details] DOC file 2
(In reply to Roman Kuznetsov from comment #2) > Confirm in 7.4 with vcl:kf5 For me, this is equally slow with gtk3, so doesn't seem to be kf5-specific. Version: 7.4.0.0.alpha1+ / LibreOffice Community Build ID: 75f7e057039aaa49558e22d18cad651d11589da9 CPU threads: 12; OS: Linux 5.17; UI render: default; VCL: gtk3 Locale: en-GB (en_GB.UTF-8); UI: en-US Calc: threaded
Created attachment 180184 [details] Flamegraph On pc Debian x86-64 with master sources updated today + gen rendering (to avoid accessibility part), I retrieved a Flamegraph corresponding to the opening of the first attachment.
DOC is 78 pages in MSO and more in LO. DOCX is also slow to open but 89 pages. 7.4 112,53s user 0,42s system 97% cpu 1:55,71 total opens 142 pages 7.0 122,31s user 0,77s system 89% cpu 2:18,12 total opens 141 pages 6.4 4,89s user 0,54s system 26% cpu 20,84 total opens 139 pages 5.4 52,60s user 3,79s system 63% cpu 1:28,50 total 5.3 49,74s user 4,75s system 67% cpu 1:20,38 total 5.2 6,13s user 7,24s system 34% cpu 38,85 total opens 80 pages 4.4 6,17s user 5,04s system 31% cpu 35,19 total 4.1 6,79s user 5,90s system 28% cpu 44,20 total Both time and pages must be tracked. This is in my bibisect plan.
Times I got are 1st time run. Next run is faster. For example in 5.3 it's the difference between 25s and 65s. There, slow down was in: source 7837860ff99577467fecb287cb0e3b111729b70a author Justin Luth <justin_luth@sil.org> Dec 02 2016 tdf#104333 revert ww8import: set table keep/split if emulated But it just reverted commit 129f93e46c29b388d38e9097869fd3e72dc40a5e from bug 91083. Already 127 pages before revert and 135 pages, so increase was even earlier. Then in 6.4 there was a real speed up (from a commit that doesn't have own bug): source 1cb7e4899b5ada902e99a0c964ee047950c07044 author Michael Stahl <Michael.Stahl@cib.de> 2019-06-27 sw: avoid deleting the iterated SwRowFrame on tdf104188-4.odt Still 139 pages, though. And in 7.0 there was a slow down REGRESSION that this bug is about: 623d6cf06ccba392c1993a3b0ad271d508205e73 author Justin Luth <justin.luth@collabora.com> 2020-04-21 tdf#73056 doc import: table margins - unknown byte is EndCell CC: Justin. Please see.
Almost certainly is just an exposed layout bug - removing "regression". Confirmed comment 8's bisect with both DOC 1.doc and DOC 2.doc. That commit was not about layout code, so it probably just exposed a table layout issue.