The delay after calling other objects in the terminal is still significant even setting r.session.objectLengthLimit to 100.
As long as the workspace can show the information from str() for a data.frame, the issue is still there.
Although I have not checked for the setting smaller than 100, the only time the issue is gone after loading 9 years data (reported in #174) was to set objectLengthLimit to 0 or 1. This time, str() information won't appear at all.