I have found that it is a good to add the below to your start up LISP

;; Purge out reg apps
(command “_-PURGE” “r” “*” “n”)
(TERPRI)

;; Purge out blocks
(command “_-PURGE” “b” “*” “n”)
(TERPRI)

;; Purge out v
(command “_-PURGE” “v” “*” “n”)
(TERPRI)