Test out: Async work with a queue
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Each of Pixel's 60 uploads a second waits about 455 ms — the web server's own 5 ms plus 450 ms while the notification service tells the uploader's followers. Pixel changes the web server to put a "notify followers" job in a line and answer at once; a separate process takes jobs from the line and has the notification service send them. About how long does an upload wait now?