[Libreoffice-bugs] [Bug 107521] Improve DirectWrite implementation font rendering on Windows

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=107521

--- Comment #12 from Andy <silvandy at katamail.com> ---
Yes I wanted to confirm the problem. After filing bug 106990, and since nothing
was changing about it, I gave up hopes and decided to settle for the ugly
rendering for the moment, switching to 5.4.1.2
Then I discovered that cell rendering in Calc, which is the app I use the most,
is now slowed down very drastically.
What is worse, though, is the fact that it seems to depend heavily on how much
data are on the cells shown on the screen - while an empty or almost empty
sheet still behaves in a barely acceptable speed, when you have large amounts
of data the performance gets worse very rapidly.
It is easy to check, just fill some 20 columns x 1000 rows with any data,
formula or numbers does not matter - and then scroll it, for example with the
page down key!
While with 5.3.1 and previous releases this was speedy and handy, moving you
around at a rate of 8-10 pages per second, it is now 5 to 6 times slower. But
what is worse is that as soon as you keep pressing the key (or clicking the
mouse button) for a little longer so that the buffer is filled (now yoiu need
just a few seconds, since operation is so slow), the sheet will start moving
for along time after you stop pressing the key, and you have to wait for all
the unwanted scrolling for long times (since scrolling is terribly slow!!). You
can imagine being around row 5000, you would like to go back to row 4000, you
click page up for two seconds, the scrolling up starts, you deperss the PGD
keys when you see row 4000 but at that point the scrolling is going on and
there is nothing you can do except sit and wait. If you are unlucky, this will
stop only after having reached the top of the sheet , leaving you more far away
from row 4000 than before!
At present, in a calc file with a considerable amount of data, the only
reliable and fast way to move around a sheet is to drag the "pointer bar" (i.e.
the part that can be dragged) in the scroll bar with the mouse - which is easy
and good when you sheet have little data, but is a difficult and painstaking
exercise when you have some thousand rows. Otherwise, you will have to always
keep in mind that you NEED to avoid pressing anything  - keys of mouse - for
more than a second to avoid endless unwanted scrolling.
If one - like me - uses CALC to manage some data and has to be quick on the
job, this problems makes downgrading again to 5.3 a reasonable option - and in
fact I am sadly considering it.
If the behaviuour described is not clear, I can make a video capture of the
screen; but it is actually very easy to check this problem

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