>>>>> Katsumi Yamaoka wrote:

> I think the possible solution is to narrow the range into the
> one with which Emacs can work lightly.  Here it is:

> (defadvice gnus-uncompress-range (before narrow-range (ranges) activate)
>   "Narrow the range if it is unreasonably wide."
>   (setcar ranges (max (car ranges) (- (cdr ranges) 10000))))

I overlooked that the argument of this function can be complicated.
Try the following one instead: