stucking merging of pages via mod_layout

Hi all,

I discovered that merging headers and footer stucks for big html files.
When I request a page of 3.8 Mb (160 000 lines) I find a text browser,
that stream stops always at the following value:
Read 3451 KB of data, 334 KB/sec.
This value is slightly changing from request to request and the request
time is 1:38 min.

Reducing the file size to (80 000) ca. 1.9 Mb stucks at
Read 1439 KB of data, 233 KB/sec.
Request time is 1:00 min.

Reducing to ca. 990 Kb (20 000 lines) stucks
Read 692 KB of data, 242 KB/sec.
at this point and has a request time of 0:29 mins.

From top to bottom the hangup time gets less, but it is surely to high in
each case.

Is this a general problem, which might be observered by other users ot
mod_layout?

How to go around this problem?

Any hint is welcome!

regards
	Harald