Ping is round trip the minimum one way delay (end to end) to a geostationary satellite is 250ms, so 500ms round trip. Everything above that is processing delay, the TDMA modems and back end networks. For file downloads and video streaming applications the propagation delay is really not a factor, video takes a 400-500ms more to start buffering or for a file to start transferring. The major issue is jitter, keeping that low is essential otherwise video quality suffers. I have tested ViaSat’s Linkway modems extensively. Appears they are using similar technology and software in their consumer modems. The delay and jitter they are advertising is very similar. VoIP and video works very well over Linkway TDMA links, but TCP suffers without some type of WAN optimization device. Most WAN optimizers use the SCPS protocol; assume this is what ViaSat’s consumer modem is using with some type of proprietary compression algorithm.