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I have the same speed AT&T DSL with 18MB with WiFi. I do not experience any buffering problems. We have several devices connected sometimes, cellphone and tablet, surfing internet, and no issues so far. However, when we watch, it is only the Roku that is streaming video. We haven't tried streaming from 2 or more devices simultaneously yet. Hope this helps.
Sorry, there was a problem. Please try again later.18Mbs service is fine for up to HD service. If you want to stream 4K UHD you should have at least 25Mbs service. So yes, you may experience buffering with 4K Only.
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