Board Thread:Questions and Answers/@comment-33062853-20171016141954/@comment-16461120-20171016172654

It depends upon which iteration we're discussing, but in terms of the Prime Marvel Universe, initially Quicksilver could run at around Mach 1, but after Isotope E enhancement he was supposedly boosted to Mach 4+, yet somehow has been shown capable of FTL speeds and time travel without explanation for the amplification to Mach 874,030+.