[nvda] Re: Processor usage

I was just curious, as I had cause to see why less tasks could be managed on a machine running nvda and media player than say, on one with hal and media player before things got stuttery and slow.
I suppose you do monitor which applications are running but not being the top dog, so to speak, maybe you could ignore msaa from these.
It might also be why some screenreaders give less info about what windows media is doing than nvda does, if Win media is going mental sending everything it has all the time! 

Brian
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----- Original Message ----- From: "James Teh" <jamie@xxxxxxxxxxx> 
To: <nvda@xxxxxxxxxxxxx>
Sent: Saturday, November 29, 2008 2:05 AM
Subject: [nvda] Re: Processor usage



On 29/11/2008 6:19 AM, List account Brians (downstairs) wrote:

nvda only uses about 10 to 20 percent of processor resources according
to the task manager, however, if say, Windows media player is running in
the background, the usage of nvda goes up to more than double this in
some cases.. This seems odd as at most only a couple of percent are
added for, say Outlook Express.

I am going to speculate that Media Player fires more MSAA events than do
other applications because it is constantly updating. For example, the
status bar is probably constantly changing, so it is probably firing an
MSAA event for each change. Although NVDA doesn't necessarily speak
every event, it still has to process some of them. (We do have some code
to avoid processing unnecessary events, but there are limits to what we
can do without limiting flexibility and functionality.) I must stress
that this is speculation; I would have to investigate more thoroughly to
be sure.

--
James Teh
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