1)Well, while the battle went pretty one-sided, his toughness still made him realize that it won't be easy to take over the world.p123 said:1) Your quote shows that Piccolo was indeed holding back.
2) Piccolo is also impressed with Weighted Goku's speed as well as Tien's while he was holding back. Both are confirmed to be faster than Krillen.
3) Yamcha was keeping up with Goku just fine before. Goku has not changed his speed.
http://mangayou.com/mangahere/dragon-ball-1/reader?page=180
Depending on how far we have him stronger than King Piccolo, Krillin may have a chance.
2)Which is strange. Considering the fact that Piccolo as his father's memory, he shouldn't be impressed by Goku's speed, as it didn't changed since back their last battle. And Goku was also clearly faster than King Piccolo.