bricscad V8 very slow working with 9 Mb 2D files

I have a routine called Killdots.lsp (courtesy of a John F. Uhden, CADvantage), which is said to "delete all single-vertex polylines, zero-length lines/polylines, and text with nothing but spaces from a drawing". Occasionally it finds a few in a file and they seem to run better, but in some recent batches of Acad files from others it finds literally thousands reducing a typical file from about 11Mb to 4Mb. That helps a lot, although certain operations such as switching between PS views and MS are quite slow.

Hello,Thanks for filing a support request with the file attached. The file contains 480477 MTEXT entities, of which 480474 have an empty content. If I delete these, the performance is OK.You can do this as well with V9: On the properties bar, on the right of the combo box that displays the type and number of entities currently selected (or the text "No Selection"), there is a button that switches the properties bar to "QuickSelect" mode. Click on the button, but please be patient, in this file it takes a while before it is ready. (we will add a wait cursor in an upcoming release...).Now the combo box shows everything in the drawing. Select the Mtexts, and again please wait until the control is fully redrawn. Now click the '*' sign next to the field labeled "Contents", and choose '=' from the drop down menu. Now you are ready to select all Mtext entities which have a contents that is equal to the empty string. To do this, click one of the buttons just under the check box labeled "Apply to current selection set" on top of the properties bar. ('add to current selection set' or 'add to new selection set', which both do the same when there is no current selection set). Now wait (this takes a while, processing all 480477 mtexts) until the properties bar is completely redrawn, displaying the properties of these mtexts. (the color box has to be green). Now the current selection set contains the empty Mtexts. Press the "delete" button or type "erase" and they're gone.

Another way of getting rid of those mysterious empty Mtexts:1. Zoom All2. Ctrl-A (or pull down Edit > Select All)3. Hold down the Shift key and do a window or crossing selection of the whole screen.4. DeleteStep 3 de-selects everything except the empty Mtexts and any insertion of the block "ADCADD_ZZ". They always get included in the Select All command, but never in a mouse selection window.This method works in v8, which doesn't have that QuickSelect bar.

http://www.freecadapps.com/swdetails.php?page=category&value=ACG-MSC&orgvalue=ACG&review=2991&rowcolor=ffffccMattia, since killdots is not one of mine perhaps I should not pass it on directly, but it is still easy to find with Google. The above link should work, clicking on "killdots.lsp" opens it in a Notepad type of format from where you can cut and paste into a new file you create.I am curious if the empty texts (and perhaps the other non-entities) only come from Acad or do they also originate in Icad?

I have seen this before, it’s likely, the problem stems from repeated pasting of DWGs, or blocks (and exploding) ,that have a few of the bad entities