314733 - Slow sending of large messages (>2-3MB)

Status: RESOLVED DUPLICATE of bug 244210

(Thunderbird :: Message Compose Window, defect)

Description

[Andrei Boros]

User-Agent:       Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.7.8) Gecko/20050511 Firefox/1.0.4
Build Identifier: Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.7.8) Gecko/20050511 Firefox/1.0.4

Mozilla slows down a lot while sending data to a smtp server, if message is very large. 
Issue exists since the last few 0.x releases till the latest 1.0.x stable release (practically since I use thunderbird)

Reproducible: Always

Steps to Reproduce:
1.create new mail
2.attach one or more file, totalling say ... 10MB 
3.send it

Actual Results:  
sending progress increases with a certain adequate speed, then it slows down by a factor of at least 4 and continues horribly slow till 100%. 
It takes a lot of time to send such messages.
The percent value where it slows down varies (unable to establish pattern so far, but often somewhere around 50%)

Expected Results:  
Send data over the network as fast sa possible. 

This is not a network issue, nor a server issue, nor a local PC issue. I have made several tests to rule these out: 

- server : P4/2.4GHz 512RAM, P3/933MHz 384RAM, both linux+sendmail
- local pc: P4/1.9GHz 512RAM, P3/600MHz 256RAM both win98, P4/2.4GHz 512RAM winXP

testcase with 2-5 attached files to a single message, yielding a messages size around 10MB (after attaching and converting/encoding the files)

tested clients : Thunderbird, Outlook express, netscape communicator 4 (mail).

tested while watching network traffic on mailserver (iptraf). No excessive traffic was observed while testing Thunderbird. 

tested while having mailserver and local PC the only machines on the network and no other workload on both local pc (only thunderbird running) and server (no users logged in other then root watching the process, no services except sendmail, no process hogging the cpu (watching "top" output)). 
Thunderbird behaved as described. 

Both netscape 4 and outlook are much faster sending the message to the mailserver, thunderbird exhibiting the described behaviour.

Comment 1

[Ray Booysen]

Per email from reporter, these have been tested on 1.5 and still appear.

Comment 2

[zug_treno]

Related to/duplicate of Core bug 244210?

Comment 3

[Ray Booysen]

Thanks Zug, marking as a duplicate.

*** This bug has been marked as a duplicate of 244210 ***