423280 - Windows Explorer (explorer.exe) uses 99% CPU when I'm downloading a file

Status: RESOLVED WORKSFORME

(Toolkit :: Downloads API, defect)

Description

[David A. Capello]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; es-AR; rv:1.9b4) Gecko/2008030714 Firefox/3.0b4
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; es-AR; rv:1.9b4) Gecko/2008030714 Firefox/3.0b4

When I'm downloading a file with Firefox (e.g.: a file of 512 KB or more), the explorer.exe start using the CPU to 99%

It doesn't matter if I'm seeing the download folder or not. Explorer.exe uses the CPU all the time, until the download finishes.


Reproducible: Always

Steps to Reproduce:
1. Start Firefox
2. Download a big file (saving it to the disk)
3. You see explorer.exe using ~100% CPU

Actual Results:  
explorer.exe uses 100% of CPU when Firefox is downloading a file to the disk


Expected Results:  
explorer.exe shouldn't be using 100% of CPU


This happens even in Firefox 2.0.0.12.

I suspect that maybe Firefox is trying to informate to the Shell32 the updated status of the file (new file size or something). But I really don't know.

Comment 1

[Stephen Donner [:stephend] Not actively reading bugmail]

Does this happen with Internet Explorer, or Safari, or Opera, too?  Are you running any extensions, and if so, does disabling them (either manually or by running in safe mode) "fix" the issue?

Comment 2

[David A. Capello]

No, it only happended with Firefox (without addons). Also I was using Opera to download big files to avoid this problem. Anyway, today I used Firefox to download a big file but it works just fine. So maybe it was a combination with other program (like TortoiseCVS or TortoiseSVN, that I uninstalled recently). I think that this bug can be closed (anyway if I can reproduce the scenario and found the right cause, maybe I'll reopen it).

Comment 3

[Henrik Skupin [:whimboo][⌚️UTC+2] (away July 24th - August 16th)]

Good idea. Please keep an eye on that. Resolving as WFM meanwhile.