My Mac desktop is running incredibly slow and takes forever to open files and apps. My adult son is very tech savvy, but is not an Apple expert. Any advice based on his input here:
Verified total storage should be 2.12 TB with 865 GB free, but the combined file total shows there should actually be more than 1.2 TB free. Temporary files have been purged. No Time Machine or local backup. The computer was purchased in 2017.
Is there a process we can use to investigate performance on this Mac?