1. If you frequently specify the color or linetype for certain entities instead of using Bylayer or Byblock features, data will increase dramatically in the drawing, and it will take more time to process these data. It is suggested to create adequate and appropriate layers to which entities of different meanings or properties can be assigned respectively, so that the option of Bylayer and Byblock can help to reduce the amount of data stored.

2. If there are lots of layers in a drawing, some of which contain complicated entities seldom used, then you can freeze these layers, so that they would not regenerate with other layers, and result in processing time saving.

3. Hatch (Fill) is a kind of entity occupying much RAM. Too much hatches would significantly drag down the processing speed. To maintain high speed:

(1) Do the hatching at the last step, so that there are no hatches affecting the speed during previous drafting steps.

(2) Assign all hatches to a single or some specific layers and freeze some or all of them if possible. Then they will not regenerate with other entities.

(3) In the Config dialogue box, select the Display tab and check the option Not display hatch while zooming.

Entities such as Solid, Donut and Trace have another kind of fill. They can be displayed faster by setting OFF for FILLMODE.

4. Text also has influence on the speed of ZOOM, REDRAW and REGEN. Simplifying the display mode of text could help to increase the speed to a large extent.

(1) Use a simple text font during the preliminary drafting work, and then replace this font with desired ones at the final stage when there are no more modifications to other graphic entities.

(2) Use QTEXT to enable quick display of text. After the command is activated, boundary frames of text areas are displayed instead of text themselves.

5. In the case that we have to insert raster images:

(1) Go to the Config dialogue box, select the Display tab and check the option Pan and zoom with raster & OLE, if it is not necessary to view raster images while doing PAN and ZOOM.

(2) Use the command IMAGEQUALITY to choose a low quality display mode, when we don't need to view images with high quality.

6. When REGENMODE is set as ON, will regenerate graphics automatically after executing some commands. Turning the mode off can help to save the time spent on automatic regeneration of graphics.

7. Entities often turn into dash line type for the purpose of highlighting when they are selected for modification. Sometimes such highlights take lots of time to display. So you can think of closing HIGHLIGHT if necessary.

Not all methods might suit each specific case, but they do help if applied properly. When you get familiar with these features, drafting work could never be a difficulty in terms of speed, and you may find it easy and convenient to use in any situations.

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