canon 100-400mm F4.5-5.6 L II why is auto focus slow

In this video I talk about why the canon lens focus is slow. I have test this lens and other copy's to find the focus is not quick enough for fast moving wild life and action shots. Don't get me wrong it is a fantastic lens but it is not been to the demands of quick action due to the focus limiter

The Canon EF 100-400mm f/4.5-5.6 L IS Mark II USM lens builds upon the success of the popular MK I. A redesigned optical system for superb sharpness, 3-mode Image Stabiliser, and an improved minimum focusing distance of 1m. This solid, super-telephoto lens with rotating zoom design is ideal for a wide range of applications, including sport, portraiture, wildlife, pet and travel photography.
Key Features: Canon EF 100-400mm F/4.5-5.6 L IS II USM Lens
Versatile super-telephoto zoom ideal for sport and wildlife
Traditional rotating zoom design (compared to push-pull on previous model)
New Optical Image Stabiliser provides up to 4-stop benefit, including 3 IS operation modes
New Zoom Touch Adjustment ring - customise the feel of the zoom control for different situations
New multi-layered Air Sphere Coating (ASC) helps to significantly reduce backlit flaring and ghosting
High quality optics - superb image quality right across the frame
Improved minimum focusing distance of 3.2 ft (compared to 6.5 ft)
Weather sealed against dust and moisture, for use under harsh conditions
Focus quickly, accurately and in near silence. Full-time manual focus override allows precise fine adjustment
Ring USM drive, high-speed CPU and optimised AF algorithms to provide quiet and fast autofocus
A Fluorine coating on lens surfaces reduces dirt clinging to the lens elements and prevents smearing
New bayonet-style ET-83D hood with side window permits filters to be adjusted easily
0.31x magnification distance

Who is it for?
The EF100-400mm f/4.5-5.6L IS II USM is a compact yet powerful telephoto zoom ideal for covering wildlife, sport and action in even the most challenging environments. Featuring advanced optical engineering, a new 4-stop Image Stabilizer and excellent weather-sealing, it offers stunning image quality in a body that has been designed with ease-of-use in mind. When used on cameras featuring APS-C sized sensors, the EF100-400mm f/4.5-5.6L IS II USM offers angles of view equivalent to a 160-640mm on a full-frame camera.

Stay sharp, whatever the light
The EF 100-400mm F/4.5-5.6L IS II USM delivers sharp, high-contrast images, using Fluorite and Super Ultra-low Dispersion (Super UD) lens elements to tackle artefacts and distortion. A 3-mode Image Stabiliser guards against blur from camera shake, allowing handheld shooting with shutter speeds up to 4 stops slower than normal.

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