Probably not, but that depends on a lot of things. This gateway will download or stream a high definition movie without stuttering, provided you're not using the internet for a bunch of other stuff at the same time. Your 100 mbps service from TWC might be delivering (to your home) less than 20 mbps, which is about what you need to stream a hi-def movie without buffering. You should check your actual download speeds online to see what TWC is providing you in real use. There are a whole bunch of sites that allow you to speed test your service. Just Google "speed test" and try them out--your speeds will vary depending on how rigorous the test is. www/dslreports.com/speedtest is perhaps the most accurate, and it allows you to test for every type of service--for example, "cable".