Hey I have a problem with the speed of IntelliCAD firstly I'm using windows 98 ( not NT ) and have an old diamond monster fusion video card. The comparison between the two programs when using the same drawing if very noticable...

Regards
Craig Paton

What program are you comparing Intellicad too ? How much memory do you have on the Video Card ? Where do you find the speed slow in any general area or just overall ? Is that Windows 98 SE ? Also how much memory do you have on your computer ?

i'm was compairing it autocad .. I have a pentium 3 with 128 meg ram, 16 meg graphics card, win 98 SE.

Sombody correct me if I'm wrong...I think
Adesk products use a proprietary display
list driver which surpasses anything VIA
Windows. HEIDI...I think it's called...or
was it WHIP.? Anyway it makes Adesk CADs
much faster display wise.

thats about what I though. That IntelliCAD is more based on the windows platform or something to that affect???

AutoCAD, since Release 14 I believe, has incorporated a "Display List Processor" to speed up graphic preformance and reduce to number of redraws and regens. Prior to r14, there were third-party display list drivers for AutoCAD, some independantly written, some written by the video card manufacturers.

HEIDI refers to an old specification for all drivers for AutoCAD (video, mouse, plotter, etc..) Whip is the current specification and incorporates the display list processor.

A display list processor is essentially a cache for the graphics. Normally when IntelliCAD (and older versions of AutoCAD) erases a line for example, it makes the change to the database, and overwrites the line on the display with the background color. That is why you sometimes with get "artifacts" the erased object on the screen. A display list processor sits between the database and the graphic screen routines. It keeps track of all the visible items on the screen. When changes are made, it makes the change in its list, and redraws the screen in memory, and updates the changed portion of the display.

Using a display list processor requires more memory, just look at what is required to run AutoCAD 2002.

so I take it i require more RAM ???