Threaded cURL. Consider experimental (what in this branch isn't?), however it drastically reduces hitching for me... so yup.

indra/llmessage/llcurl.h

@@ -241,7 +241,7 @@ public:
 	void slist_append(const char* str);
 	void sendRequest(const std::string& url);
 	void requestComplete();
-	S32 perform();
+	void perform();
 	bool getResult(CURLcode* result, LLCurl::TransferInfo* info = NULL);
 	std::string getErrorString();