So the preview for the new Mighty Thor came out, and there's a particularly interesting feat in it. It can be seen in these two images. Basically, Gladiator crosses an intergalactic distance while Heimdall is blinking in order to beat him. To low-end it I'll be assuming Gladiator was already on the edge of the galaxy he was coming from.
Intergalactic Distance - 6,532,000 lightyears
Blinking Speed - 0.4 seconds
And, well, that's about all we need.
6,532,000 lightyears/0.4 seconds = 1.54e23 m/s
Results
Gladiator Blitzes Heimdall - 5.14e14c, MFTL+