Sometimes it can be really slow and jerky to zoom or pan a small-sized drawing no more than 1 MB. A user had reported this issue and sent me the drawing about 800 KB.

There was not too many contents in the drawing and no redundant data, then why is that?

After careful check, I found that the table and chair blocks have caused this. After deleting those blocks, zoom and pan become smoother.

So what’s so special about this block?

We can see that there are objects behind that are shaded by the table and chair blocks, which means the blocks are to add wipeouts. Double-click the block editor and it shows there were 20 wipeouts, 10 chair blocks, 10 tableware and every chair block has a wipeout, which makes it 30 wipeouts in total, exit the block editor and mark all the blocks that have the same names, there would be 44, so there are actually 30*44=1320 wipeouts in the area. There are other blocks such as sofa, table, but in small number, which won’t affect the overall performance of CAD.

Now here comes the question, if we delete the wipeouts in the block, the speed of zooming and moving objects would be greatly improved, however, the block would overlap with the objects below and the drawing would be a little messy, as shown in the following picture.

So it’s really up to you to choose the better speed or better look.

Why is it that wipeout makes poor performance of CAD?

The wipeout in CAD is like an image: the more raster images we insert, the poorer performance of CAD system we get, for example, if we copy an OLE image and paste it for hundreds or thousands of times, we’ll get a much slower CAD system.

Although some objects are relatively small and won’t occupy much storage, but they may generate complex data for displaying and therefore affect the overall performance of CAD.

We have talked much so far, if you have any questions or experience to share, please leave a comment or send a message, we’re looking forward to your feedback.

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