Feat can be seen here. Wonder Woman gets knocked unconscious for the billionth time in the series. But before that, she deflects some green light blasts. Is it just me, or she gets knocked out every episode?
Assumptions[]
Those green thingies are light beams. Pretty sure they move lightspeed. Aside from the fact they are light beams themselves, they are mentioned and implied to be lightspeed.
Distance[]

Wonder Woman's height: 122 px or 1.6 m, I guess
Panel height: 223 px
2atan(122/(223/tan(70/2))) = 41.9209928201 degrees
According to this page, the distance is 2.0884 metres.
Reactions[]
2.0884/299792458 = 0.000000007, or 7 nanoseconds
That's Relativistic perception.
Speed[]
1 metre or so to block?
Therefore a bit less than 48% the SoL, or Relativistic.
Errors[]
Wonder Woman is taller than Batman, who is 1.88 m. I'll assume she's 1.9 m. Correct distance is 2.4799 m.
2.4799/299792458 = 0.000000008, 8 nanoseconds
Relativistic perception
Wonder Woman's head height would be 0.2529375 m if she's 1.9 m tall. She moved her arm 73 px, and his head is 75 px. Distance is 0.2461925 m.
Real result is 30 774 062.5 m/s, or just over 10% SoL. Baseline Relativistic