Shower trap pipe fall

[smallsteve]

Just wondering what kind of fall you would expect in the waste pipework for one of these modern low profile trays with a 90 mm trap? I’ve seen 15 mm / meter mentioned on this website, but I am not sure if that is suitable for high flow traps?
I am considering the current pipework as seen in the attached picture and I drop 14 mm over a half meter, which I assume is more than enough!?
TIA

 

[ShaunCorbs]

Min 15mm 25mm better per m

Yours is fine at 30mm a m

 

[smallsteve]

Min 15mm 25mm better per m

Yours is fine at 30mm a m

Thanks Shaun.