Timing is absolutely important. Articles sit for such a limited time in the queue that you only have a small window to upvote. I've seen the same article poste

Timing is absolutely important. Articles sit for such a limited time in the queue that you only have a small window to upvote. I've seen the same article posted by the same user at different times of day, and the ones that landed at the the right time got upvoted and the others didn't. I haven't collected the stats on what an optimal time is, but I'm guessing it's the start of the workday in the Eastern time zone (where the the majority of the population of Canada and United States is concentrated).