[Libreoffice-bugs] [Bug 137841] New: Sluggishness in "web view" mode with a long document

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=137841

            Bug ID: 137841
           Summary: Sluggishness in "web view" mode with a long document
           Product: LibreOffice
           Version: 7.0.2.2 release
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Writer
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: ckoresko at atlanticbb.net

Description:
On a new Fedora 33 with LO 7.0.2, I opened a 52000-word .odt document in Web
View and noticed that I could easily out-type the new Writer.  Scrolling was
also slow and chunky, especially when scrolling past graphics.  (The speed with
a small document was normal.)  I tried the 6.4.7 version from libreoffice.org,
and confirmed that it is much more responsive.  I also tried the 7.0.2 version
from libreoffice.org and confirmed that it was slow (although perhaps not quite
as slow as the Fedora 33 7.0.2).

It looks like something's wrong with Web View in LO7.

Steps to Reproduce:
1. Open a long (50000-word, with graphics) document in Writer
2. Jump to the end of the document
3. Type

Actual Results:
Characters appear with a noticeable delay, in clusters

Expected Results:
Characters appear without a noticeable delay, one per keystroke, as is the case
with LO 6.4.7


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
This was found on Fedora 33 running on VirtualBox 6.16 on a Windows 10 host.  I
tried the Fedora 33 version of 7.0.2 with the switch to start in "safe mode",
but it showed the same sluggish behavior.

I'm not sure if OpenGL was enabled.  "Use hardware acceleration" is checked,
which I suspect means it was.

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