Also forgot to post her speed feats. Best one from her being in the first arc of the series where she’s able to perform several slashes on the floor to knock Index off her feet to redirect a literal photon beam before the beam could reach Touma when it was just inches from his face.
“His right hand feeling a hair's breadth from dismemberment, Kamijou immediately braced it with his left, grabbing his right wrist. A shocking pain erupted on the palm of his right hand. The magic was cutting into his skin...His right hand's ability couldn't keep up, and the beam was edging closer to Kamijou, one milimeter at a time.
its not just the sheer quantity...! Its like every single photon has its own properties!!"
...
A very nasty sound emanated from his right pinkie.
It bent at an unnatural angle... and broke. The instant this registered, the indescribably powerful pillar blew through his defense.
His right hand recoiled away.
The shaft of light rushed at his defenseless face at a speed beggaring imagination...
...Salvare000!!
Just before the pillar of light hit him, Kamijou heard Kanzaki shout.
It wasn't Japanese. it wasn't any language with which he was familiar. But he heard something similar- it was a name. It had been when he faced Stiyl in the student dormitory. It was the name Stiyl'd said all magicians must give when using magic. Her magic name.
The nodachi Kanzaki held, close to two meters in length, sliced through the air. The Seven Glints, using seven metal wires, approached Index with sound-splitting speed.
But her attack wasn't aimed at Index herself.
The seven metal wires shredded the frail tatami at Index's feet all at once. Suddenly without footing, she began falling backward. The magic circles linked to Index's eyes moved as well, causing the pillar of light aimed at Kamijou to move as well.
The beam swung upward like a giant sword, rending the wall, then the ceiling, leaving nothing in its wake. Even the black clouds floating in the night sky were torn open... It might even have sliced through satellites in low-Earth orbit.”
Besides that, she’s blitzed and statued a whole team of British Knights who were fast enough to cut apart a lightning strike from the sky, she’s faster than Misaka who can react to and dodge point blank electron beams that move at or nearly the speed of light, and also should be faster than several other characters with casual lightning timing feats such as Gunha and Mugino.