Comment 8 for bug 1171047

Using -o Debug::Acquire::https=true I was able to discover the cause of a big gap: near the end of the update it goes through all the archives and spends several minutes silently trying to grab compressed ddtp translations from all of them. Without debug logging it only logs the final, uncompressed set.

I see it first probing for Translation-en.xz and Translation-en_AU.xz for every archive, followed by the lzma versions, then gz, then eventually the uncompressed variants. All of these 404, causing the SSL connection to be renegotiated (my previous comment was incorrect; it only reconnects on error, but there are so many unlikely probes that it might as well reconnect every time). I have a few Humble Bundles installed, for something like 25 private PPAs. 25 PPAs * 4 compression algorithms * 2 languages == 200 requests just for Translation-*. Since none of those 200 files exist, there's an SSL negotiation for every single one, which is somewhere around a second from Australia. So there's about four minutes there.