: Keep your files "light" using the PURGE command to remove unused objects and OVERKILL to delete duplicate geometry.
If you are still running AutoCAD 2015 on a legacy Mac system, certain best practices ensure it remains stable: AUTODESK AUTOCAD 2015 -MACOSX
: If the software behaves unexpectedly, "Reset Settings to Default" is a reliable fix. This allows you to back up your customizations into a ZIP file before returning to a clean slate. Where Does 2015 Stand Today? : Keep your files "light" using the PURGE
However, for those maintaining older projects, AutoCAD 2015 remains a robust, "perpetual" style of workspace that paved the way for the high-performance design suites we use today. Where Does 2015 Stand Today
If you'd like to explore how to to a modern version or need help with a specific command , Solved: General Autocad Issues - Forums, Autodesk
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118 U.S.C. § 2257 Record-Keeping Requirements Compliance Statement