I've noticed that SpamSieve is taking an enormously long time to load initially. Before, it would take 10-15 seconds to load when launching Mail. Now, it's 60-90 seconds. Could something have gotten corrupted? Is this a Mavericks issue?

Note: This is only happening when launching for the first time after a reboot. If I close Mail and relaunch, SpamSieve only take the 10-15 seconds to launch.