I'd say Goku was roughly Supersonic prior to his fight with Frieza, then when he fought Frieza he became light speed then exceeded light speed indefinitely after that.
It got to a point to where even Gods (kais) couldn't sense his energy level yet looking after the entire galaxy for millions of some years. Lol.
I tried playing a Netflix video and while the quality was HD it continually stuttered. Thanks Verizon.