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Here's how I got all items for Demuestra tu fuerza in a timely manner:

Started off at Affliction Ridge (roughly 46,64) and got:

Cristal elemental from Furiavapor ondulante
Ojo de gronn from Lanzapiedras gronn
Escama de gronnito from Rompehuesos gronnito
Flor botani from Juraverde botani
Diente de goren manchado de ácido from Horadador goren

I then went north to the Ogron cave at 43.6 48.2for:

Cuerno ogron desgastado from Aplastaespinazos ogron

Back south to Mistcreep Mire (50,69) for:

Aguijón de avispa from Aguijonero de la Calígine
Escama de basilisco from Basilisco de lodazal

And lastly, I ran south out of the mire into Razorbloom (48,74) for:

Espina orca from Orco infestado
Garra de devastador from Devastador verdeante
Rama antigua from Defensor de la floración

The last group at Razorbloom is a bit tricky to get in one go, but grab a coffee in between or something ;) (or write a WoWhead post like I did now). To get from the Bloom Defender at 48,74 to the ravagers and orcs on the other side easily you can get through the thorns surrounding the defender at 48.15 , 74,93.
Of course you can also do it in a different order per group, I did it on the spot. In the end you got 10 minutes in between each time so it won't get any faster than 40-50 minutes anyhow.

Hope this helps! Good luck!

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Capturas de pantalla

Vídeos

Garra de devastador