I have experienced unbearably sluggish scrolling and typing in LyX that
after much research I attribute to a poor interaction between Qt 4 and my
NVIDIA graphics card driver.

I solved these issues by starting LyX with:

lyx -graphicssystem raster

I have seen this problem described using both GNOME and KDE with NVIDIA
cards (though there also appear to be unrelated scrolling and typing lag
problems out there). The same fallback helps with other Qt-based programs I
run, but beware that it may cause some rendering glitches (though I have
not seen any in LyX).


- Thomas

On Thu, Apr 26, 2012 at 3:17 PM, Richard Heck <rgh...@comcast.net> wrote:

> On 04/26/2012 11:02 AM, David L. Johnson wrote:
>> On 04/26/2012 10:30 AM, Rashif Ray Rahman wrote:
>>> Hi all
>>> I've not been a LyX user for long but am going to write a 300-page
>>> academic paper with it for the final typesetting and formatting. I've
>>> practised on and off for the past few months but one thing that has always
>>> troubled me is how I'm unable to scroll with the keyboard (up and down
>>> arrow keys). I'd like to be rid of the mouse if possible.
>>> When I hold a particular directional key for up to 20 secs it appears to
>>> work but as if it's in slow motion. Qt shouldn't be having any such
>>> scrolling problem, so I haven't been able to troubleshoot this any further.
>>>  I don't see this behavior at all.  The only thing that slows down
>> scrolling with the arrows is if the cursor enters a math formula.  Then it
>> runs through all the superscripts and subscripts, but still it is
>> reasonably fast.
>> You also might try using the <Pageup> and <Pagedown> keys.
>> What system are you using?  Mine is debian testing (a linux variant), on
>> a fast machine -- but it works well on even my slow netbook.
>>  There have been occasional reports of this kind of problem, usually
> connected, as far as we can tell, to interactions issues between LyX and
> certain video drivers. So I'll ask, too: What system is this and, if it's
> Linux, what desktop, what window manager, what X drivers?
> Richard

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