QFileDialog performance issues when typing known file path

When typing a known file path into the QLineEdit widget of the QFileDialog, if one of the directories in the file path contains many files, significant delays occur while the entire directory contents are loaded, including for the completer list.  When one is typing a known file path this delay is extremely annoying, and can be quite long if the directory contains thousands of files or directories.

Would it be possible to add an option to delay resolving the path until typing stops for a certain period  of time (preferably a settable number of milliseconds or seconds), or until Return or Tab is entered?