Buffy chases after a speeding bus from roof tops, after being stab in the stomach no less, so she's running at least in the 40-60 mph range there...
Buffy steps on a Bear trap in the dark, but then pulls her foot out before it snaps shuts in a slow motion shot. These traps close at speeds faster than you can see, and well over 300 FPS.
Various feats of bullet timing from point blank shots, multiple shots by a high train Watcher, gunfire of a army, rapid fire from Darla, and heavy gunfire from two sides at one time by Watchers. Evades Adam shooting a machine gun at her as well.
Like with strength, in the series it isn't highlighted a lot, but its pretty impressive.
she was also highly trained, and slayer powers come with residual memories of fighting style/instinctive fighting ability
In the famous episode that touch on innate skill, it is stated Slayers on the subconscious level have the memories, and experiences of past slayers. When they "Activate" the skills are natural and present in them to a degree. They cannot recall experiences and such when they try to, but they have it in them. Proven in this episode when a young girl who "activated" had the skill and memories of the Boxtor Rebellion Slayer that Spike had killed, speaking a asian language, and enough skill to decimate Spike. Even though said girl had no training, or was taught any other languages. This is also shown in the canon origin comic of Buffy.
With zero training and effort, Buffy effectively uses official weapon maneuvers and styles to beat Giles on her first day of training with the quarter staff. Even though Giles been taught all his life as a kid weapon styles, hand to hand, and magic by the Watchers. Innate skill pulling through. Giles still spent over three years honing Buffy's skills to the best it can be, which shows thanks to Buffy 7 seasons, and 100s of comics.