How to Quickly Open Files in Autodesk Inventor
You can accelerate file open times of the designated assembly by using the available cache to keep the participating files in memory.
Enable Quick File Open Select to enable using available cache memory. Clear the selection to disable storing files in the cache.
Cache the last opened assembly file Select to store the last active assembly file in the available cache.
Cache files of the selected assembly Select to specify the assembly to store in the available cache. Use the browse function to navigate to required assembly file.
How to enable, the above settings, see the figure below