I think there is something else going on here. While it's plausible that different browsers may introduce some processing latency, we are definitely not talking

I think there is something else going on here. While it's plausible that different browsers may introduce some processing latency, we are definitely not talking about 100ms+ delays, or 30 to 8Mbit throughput drop. More likely.. try disabling your extensions, see if that helps. If that doesn't help, try creating a new profile.