This is lightning since the Chaos Emerald caused a storm to create it.
Pixel Scaling[]
Neon is the same height as Sonic (1 m)
Distance lightning traveled: 1*(543/132) = 4.11363636364 m
Distance Neon traveled: 1*(668/132) = 5.06060606061 m
Calculation[]
Lightning is 440000 m/s
Timeframe: 4.11363636364/440000 = 0.00000934917 s
Speed: 5.06060606061/0.00000934917 = 541289.340188 m/s
Tally[]
Neon saves Sonic: Mach 1578; Massively Hypersonic+