Problem

I’ve tried different thumbnail sizes and it doesn’t seem to matter what size it is, it just has problems loading thumbnails. The more pictures that are in the folder, the worse it is. I know Explorer wasn’t really designed to handle loading thumbnails for 10,000+ pictures, especially over a 100 MBit network connection… but this is really bad in comparison to Windows XP Pro. I never had these excessive thumbnail load times in XP.

Possible Solution

At least for me it was a setting in the Network Adapter Advanced Settings tab.  I have a Realtek Gibabit Network Adapter and one of the settings must have been defaulted incorrectly.

I changed the following 2 settings to ‘disabled’ and it immediately started working great:

• Disabled   IPv4 Checksum Offload
• Disabled   Large Send Offload (IPv4)

Either the latest driver update from Realtek or a Microsoft Driver Update must have defaulted one or both of these settings incorrectly.  I’m not sure if both values to disabled needed to be done, it may have just been one of them.  But, once it worked, I just didn’t feel like messing with it any more to figure out which one it was.

Update

In further research I narrowed it down to it just being the Large Send Offload value.  That is getting set to “enabled” every time I update the Realtek driver to the latest version.  If I then go in and set it to “Disabled”, everything is working fine.

Another possible troubleshooting item is to disable the  Background Intelligent Transfer Service.