It takes it a while in my connection [10 MB Connection] it's nothing tho once you choose the Pixels ,the buffering will also depend on that and won't matter that much ,in short it will load in like 10 sec in your case
-Will I comfortably be able to watch streams from then on? or will it still buffer every 3 seconds?
Yes ,it will buffer every 5 atleast and at that 100kbps speed continuous stream would be a little frustrating