(defun silly-eldoc ()
  (dotimes (_ 10)
    (url-retrieve-synchronously "http://www.google.com"))
  "done")

(setq-local eldoc-documentation-function #'silly-eldoc)

(setq-local eldoc-idle-delay 0.05)

; asdadasdasdasdas

; aadasdsddsdasddddasds
; asssddasaaaaa