We use an integration with SOLIDWORKS that in the past specified to have this option enabled. Now that the option is no longer available, my question is whether the behavior of SOLIDWORKS 2019 is as if this option is enabled or disabled.
As you noted “No preview during open” was removed in 2019 intentionally. The behavior now is a preview WILL be shown during open. (option unchecked\disabled)
Some history - this option was added in SolidWorks 2006 SP1 when SolidWorks implemented multi-thread loading of files and you could still purchase a PC with a single core processor!
Since 2006 on, unless the option was enabled… One thread would load the display data (eDrawings\Quick View data) so users can spin their model around and such while a second thread loads the actual data for the part\drawing\assembly.
From 2006 SP1 release notes “You can reduce the time to load models by selecting No preview during open in Tools, Options, System Options, Performance. Selecting this option disables the interactive preview that otherwise appears while the model is loading.” (http://files.solidworks.com/Supportfiles/Release_Notes/2006/english/relnotes.htm)
This option was removed for a variety of reasons. The primary reason was it is not actually “Faster” as the option indicated!
In all but a few test cases, the File>Open was SLOWER with the option enabled as SolidWorks took an entirely different\legacy code path to load your data.
The other reason it was removed, continuing with the legacy code path – there were a great number of odd-ball bugs which this option triggered. (Example, no thumbnails for files updated with SW task scheduler … because it never loads the display data to take the thumbnail snapshot!)
Happy to answer any other questions you have about this
Mark Johnson | Expert Technical Support Engineer, SOLIDWORKS Escalation Manager, Americas
Dassault Systèmes SolidWorks Corp.
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