Wirecast goes through a process called compositing where it decodes all the separate inputs (movies, images, live cameras, etc. In the highly unlikely situation that you are hitting a bottleneck in your record to disk, you may need to upgrade to a RAID hard drive setup or lay down the cash for an SSD. BandwidthThere are several different ways that you can broadcast to the web.
If your stream is refused for no apparent reason, I would check to make sure that you have not exceeded the data rate limitations for that site. You can calculate this by seeing what your maximum upload rate is (from your internet service provider), and by making sure that your presets never exceed that amount. Typically, I think you can get away with as low as 24fps (standard film) on a stream without it….