[whatwg/xhr] Wrong upload progress event raising (#127)

I'm trying to send a payload of determined size (for example 1MB, 2MB) using XMLHttpRequest monitoring upload progress.
Progress event.loaded is reaching event.total too fast, for example with a payload of 1MB the transmission should take about 10 seconds while event.loaded become equal to event.total into about 5 seconds. After this first five second, system monitor (both windows and ubuntu) show that an upload transmission is taking place for other 5 seconds (as it's reasonable) and only after system monitor notice the transmission is ended ( event.loaded is equal to event.total since 5 secs before ) i receive the response (as it's reasonable).

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https://github.com/whatwg/xhr/issues/127