I've installed this plugin on two Linux VPS servers. I couldn't figure out why they kept slowing down and hanging for several seconds each time a post got tweeted. I've got several sites on both servers and everything's been running smoothly for months on them with several blogs and plugins. I finally deactivated all plugins and did some experiments with just the wp-twitter plugin activated and found at that each time a post got tweeted the plugin was consuming over 400MB of ram! Needless to say I had to deactivate it, which is a shame because I'd really like to use it. Has anyone else experienced delays when posting tweets from WP?