Forum:Welcome message taking too long

I was just wondering, why Wikia's welcome bot took so long on my wiki between the time a new user edited and the time the welcome message was posted on their wall. Does the specific message affect the time it takes for the time? If it does, how can I shorten this time without changing the message? -- 05:43, October 2, 2012 (UTC)
 * The bot works by placing new users to welcome in a queue, and a separate process later adds the welcome message. In non-busy times this normally means it's fairly quick - but if there are a lot of actions in the queue (this queue is the same one that also processes large amounts of blog comment moves or deletions), it can sometimes take a while for the bot to reach that edit in the queue. --  Random Time  06:33, October 2, 2012 (UTC)