Switch picture slowly when short by type in browser mode

[Guest]

* Sorry for my poor English ^_^

Computer: E2140, 1G of RAM
OS: Windows Server 2003 Standard Edition with SP2
XnView version: 1.92.1 (Jan 29 2008)

1, A folder that with about 200 .htm files and 200 .jpg files
2, Associate .jpg file with XnView
3, Open XnView browser mode, click "short by" button, select "Type"
4, Close XnView
5, Enter the folder and open one of picture
6, Switch picture by press PageUp or PageDown, it will delay about 4-5 seconds
* Sort by name will not have this problem

[xnview]

The problem is i must check the file type for every files to sort them...