There is also the issue that horses move very differently over the various surfaces.Figure compression may answer some performance issues but a runners physical attributes/makeup may determine at what level he can perform over it.
Turf/synth/poly all have horses moving on top of the surface(they go into that surface app 1.5 inches on a normally.
Dirt runners often find themselves powering through up to 3+ inches of cushion.Some trainers say say that dirt fitness isn\'t the same as poly fitness. As Cov mentions, the farther a horse travels on these artificials, the more tiring it becomes(more so than dirt reportedly)
From the rather limited sampling of the synth era, I think like all tracks, the most important factor is how each individual horse moves over a surface whether it is dirt, turf,synth.There appears to be certain breeding which does well on the various synths compared with their dirt results.
Many horsemen/players are pretty much of the opinion now that poly equals turf and vice versa, synth/cushion also, to a lesser extent.As long these surfaces remain rather unkind to early gas,I\'ll mainly sit out.
Mike