We make optimizations in Sitefinity upload control with is actually based on the RadUpload for Silverligh. With SP2 there would not be a problem to upload 1 GB for less then 5 minutes.
Currently we upload the item by chunks. Each chunk is 1MB, so there would not be problem with 25 MB. If you run the project through our ProjectManager or Visual Studio can you upload larger files? You can also increase maxReaquestLength
in the web.config. The default value is 4 MB.
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