2.34 FAQ-468 My Origin project file is very slow to work with. How can I improve this?

Last Update: 5/20/2021

If your project is slow to load, or Origin runs slowly while you have your project open, try the following:

  • If you have a large number of windows (especially graph windows) within a single Project Explorer folder, you can try moving some of them into subfolders. There are also several options for not displaying windows.
  • Additionally, when your current project folder has a large number of graph windows and you prefer not to hide windows, you can try reducing the value of system variable @NPP. In doing so, you can prevent partially-covered graph windows from repainting and thereby reduce demand for system resources. See this FAQ for instructions on changing the value of a system variable.
  • Sparklines are "thumbnail" graphs that can be displayed in the worksheet column. If you have a large project file with many workbooks, and those workbooks contain sparklines (displayed or hidden), your system may perform poorly or become unresponsive. For information, see How can I remove sparklines from an Origin project file (OPJ) that is very slow?
  • If you have a big project file that periodically freezes, this may be caused by the Autosave feature. To turn off Autosave, click Preferences:Options, select the Open/Close tab and uncheck Autosave Project Every xx Minute(s).
  • Try clearing the Results Log ( to display, click View: Results Log or press ALT+2). Prior to Origin 8.6, logging for many functions was enabled by default when importing, and thus these entries could accumulate over time. If you are concerned about losing the Results Log content, copy content to a Notes window and save it with the project file. Beginning with Origin 2020b, Origin will ask to clear the Results Log if you reach 30,000 entries (see system variable @CRL).
  • OPJ files created with some older Origin versions might have some redundant internal objects (empty operations) saved in the file. Later versions of Origin fixed this problem but, in particular, files created with version 8.5.1 may still contain many of these redundant objects. You can try deleting the empty operations in the OPJ file. Click Window:Script Window to open the Script Window, then type the following and press Enter:
del -op
  • Loose datasets have been found to accumulate in some projects over time and bloat the project. To delete all datasets that are not in a worksheet and are not used in any graph, click Window: Script Window and at the prompt, type the following:
del -as
  • Origin 2018 introduced a new Unicode-compliant project file type -- OPJU. If you have upgraded to a recent version of Origin and you have older project files of the OPJ file type, consider resaving the files to the new OPJU format as it can produce significantly smaller project file sizes and faster loading and saving times.

See Also:

Keywords:project slow, slowness, freeze, sluggish, OPJ, Project Explorer, hide windows, autosave, save, open, sparkline, results log