How can I cache the master page in ASP.NET?
Unlike user controls, you can't OutputCache a Master page by itself--only as part of a Page.
Also, OutputCaching won't help the performance of a toolbar with lots of images anyway.
The kind of things that would help include image sprites, client-side caching, using a CDN, using multiple domains for static files, etc.
In case it's helpful, I cover those strategies in my book: Ultra-Fast ASP.NET.
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