[Bug 279654] Re: firefox hangup while drag text in kde4

[Jahava]

I wanted to post to confirm the bug. I'm using Kubuntu 8.10 with KDE4
and running an NVidia graphics card supported by their proprietary
drivers. 'kwin' consumes large amounts of CPU when you highlight and
drag text in Firefox. When you highlight more than a line or two, this
results it the system hanging for extended periods of time. Highlighting
just one line still has a working text-drag effect (with very high CPU
consumption).

On Windows and KDE3 with Firefox 3, the text-drag action results in the
selected area being rendered in a transparent (and, depending on the
quantity of text, scaled) form which follows the cursor around until
released. The KDE4 version (when selecting small enough quantities of
text to avoid hanging) seems to be visually similar to the KDE3 version.

You are correct when you say that it's related to desktop effects, as
disabling them completely solves the problem. Furthermore, changing the
Compositing Type from 'OpenGL' to 'XRender' also solves the problem, so
it seems like it's a KDE4/OpenGL issue that may also involve (or be
caused by) the NVidia proprietary driver.

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firefox hangup while drag text in kde4
https://bugs.launchpad.net/bugs/279654
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