Why does the comand `lsof` run very slow and consume high cpu when a multi threaded process has many open files?

Issue

• When invoking lsof all open files of a thread are listed and this causes long delays. How to disable to iteration through all threads?
• The command lsof shows all open files of a multi-threaded application, could this be limited to the main-thread?
• The command lsof consumes high cpu memory when run on highly threaded application with potentially tens of thousands of files open.