If any of you out there like to use the thumbnail view,  especially for browsing through photos and images, it can become a bit of a  drain on your system. It is possible to lower the thumbnail size and quality by  editing the following registry keys.
Open the registry and navigate to  :
HKEY_CURRENT_USER\ Software\ Microsoft \ Windows\ CurrentVersion\  Explorer
Create a new DWORD value called ThumbnailSize, and set the value  between 32 and 256.
And/or create another DWORD value called  ThumbnailQuality, and set the value between 50 and 100.
Key Details  :
USER Key: [HKEY_CURRENT_USER\ Software\ Microsoft \ Windows\  CurrentVersion\ Explorer]
Value Name: ThumbnailSize
Data Type: REG_DWORD  (DWORD Value)
Data Value: 32 - 256
USER Key: [HKEY_CURRENT_USER\  Software\ Microsoft \ Windows\ CurrentVersion\ Explorer]
Value Name:  ThumbnailQuality
Data Type: REG_DWORD (DWORD Value)
Data Value: 50 -  100
 
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