Got 60 MBs but don't have yr problem!!
Even my Smart devices dont buffer!!
If your TV shows less Speed than the Lap top,,,depends on the Quality of the Device that is Using/ Running/ or Delivering the internet!!
I will repeat hard-wire(with an ethernet cable) those devices to the internet source and see if the speed aint faster!!! If still slow when hardwired,,,then contact yr internet-service- provider!!