Is C# Slow?

[Martijn Mulder]

I have a creeping suspicion that, no matter how well organized my code is
and no matter how smart I Invalidate( ) only part of the screen, the
graphics under C# is s-l-o-w.

Is that an issue?

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

What are you doing?
--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation
"Martijn Mulder" <i@m> wrote in message
news:44***********************@news.wanadoo.nl...

I have a creeping suspicion that, no matter how well organized my code is
and no matter how smart I Invalidate( ) only part of the screen, the
graphics under C# is s-l-o-w.

Is that an issue?

[Martijn Mulder]

>>I have a creeping suspicion that, no matter how well organized my code is

and no matter how smart I Invalidate( ) only part of the screen, the
graphics under C# is s-l-o-w.

Is that an issue?

What are you doing?

I am 'tiling' the screen with many small pieces + animation

[Lucian Wischik]

"Martijn Mulder" <i@m> wrote:

I have a creeping suspicion that, no matter how well organized my code is
and no matter how smart I Invalidate( ) only part of the screen, the
graphics under C# is s-l-o-w.

In my experience, the bulk of graphics time is taken up by the
operating system drawing calls (for drawing text, lines, polygons...).
The language you use to invoke them could be ten times slower without
impact. Even in DirectDraw/Direct3d, the bulk of the graphics time is
taken up by the cost of BitBlt or texture rendering in hardware, and
the cost of your own code is insignificant.

--
Lucian

[Bob Powell [MVP]]

Blitting under GDI+ does not take advantage of hardware accelleration.

A touch of interop to the BitBlit or StretchBlit API will help. Using
DirextX via the DX9.x .NET wrappers will speed it up enormously.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

"Martijn Mulder" <i@m> wrote in message
news:44***********************@news.wanadoo.nl...

I have a creeping suspicion that, no matter how well organized my code is
and no matter how smart I Invalidate( ) only part of the screen, the
graphics under C# is s-l-o-w.

Is that an issue?

What are you doing?

I am 'tiling' the screen with many small pieces + animation

[shumaker]

I have 10,000 rectangles in a window and it updates about 50
times/second without flickering.

I use these commands:
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.AllPointingInWmPaint, true);
SetStyle(ControlStyles.DoubleBuffer, true);

as well as using GDI+ to draw my rectangles.

Martijn Mulder wrote:

I have a creeping suspicion that, no matter how well organized my code is
and no matter how smart I Invalidate( ) only part of the screen, the
graphics under C# is s-l-o-w.

Is that an issue?

What are you doing?

I am 'tiling' the screen with many small pieces + animation

[Martijn Mulder]

Is there hope that you will write and publish an article on DirectX in a
managed application?

(Btw, the link on page http://www.bobpowell.net/why_so_slow.htm to
directx.asp is no longer valid)

"Bob Powell [MVP]" <bob@_spamkiller_.bobpowell.net> schreef in bericht
news:e3**************@TK2MSFTNGP05.phx.gbl...

Blitting under GDI+ does not take advantage of hardware accelleration.

A touch of interop to the BitBlit or StretchBlit API will help. Using
DirextX via the DX9.x .NET wrappers will speed it up enormously.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

"Martijn Mulder" <i@m> wrote in message
news:44***********************@news.wanadoo.nl...

I have a creeping suspicion that, no matter how well organized my code
is and no matter how smart I Invalidate( ) only part of the screen, the
graphics under C# is s-l-o-w.

Is that an issue?

What are you doing?

I am 'tiling' the screen with many small pieces + animation

[Bob Powell [MVP]]

I might publish one of my existing articles on DirectX on my site.

Subscribe to the RSS feeds.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

"Martijn Mulder" <i@m> wrote in message
news:44**********************@news.wanadoo.nl...

Is there hope that you will write and publish an article on DirectX in a
managed application?

(Btw, the link on page http://www.bobpowell.net/why_so_slow.htm to
directx.asp is no longer valid)

"Bob Powell [MVP]" <bob@_spamkiller_.bobpowell.net> schreef in bericht
news:e3**************@TK2MSFTNGP05.phx.gbl...

Blitting under GDI+ does not take advantage of hardware accelleration.

A touch of interop to the BitBlit or StretchBlit API will help. Using
DirextX via the DX9.x .NET wrappers will speed it up enormously.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

"Martijn Mulder" <i@m> wrote in message
news:44***********************@news.wanadoo.nl...

>I have a creeping suspicion that, no matter how well organized my code
>is and no matter how smart I Invalidate( ) only part of the screen, the
>graphics under C# is s-l-o-w.
>
> Is that an issue?
What are you doing?

I am 'tiling' the screen with many small pieces + animation

[Bob Powell [MVP]]

Are you perchance using a Matrox graphics card? They are AFAIK the only ones
that support hardware accelleration for GDI+ and unless you have a really
kick-ass system I would be sceptical at those kinds of frame rates from
GDI+.

It might run like a dream on your machine but probably not on the standard
HP supermarket PC which is quite capable of running stuff like half-life or
flight-sim at excellent frame rates.

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting
http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks
http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.

<sh******@cs.fsu.edu> wrote in message
news:11**********************@z34g2000cwc.googlegr oups.com...

I have 10,000 rectangles in a window and it updates about 50
times/second without flickering.

I use these commands:
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.AllPointingInWmPaint, true);
SetStyle(ControlStyles.DoubleBuffer, true);

as well as using GDI+ to draw my rectangles.

Martijn Mulder wrote:

>>I have a creeping suspicion that, no matter how well organized my code
>>is
>>and no matter how smart I Invalidate( ) only part of the screen, the
>>graphics under C# is s-l-o-w.
>>
>> Is that an issue?

> What are you doing?

I am 'tiling' the screen with many small pieces + animation

[shumaker]

It's running gforce 5700 le I think and has a 1.2 GHz AMD Athlon
processor.