> If graphics is not the biggest issue, what is then in your opinion? Graphics is the biggest issue, but the issue isn't at the API level. It's in the driver a

> If graphics is not the biggest issue, what is then in your opinion? Graphics is the biggest issue, but the issue isn't at the API level. It's in the driver and hardware differences below that layer. The "tax" as you call it, comes mostly from the hardware drivers leaking through the abstraction. Part of this is AAA game developers fault since they are attempting to use all the GPU with edge-case tricks to eke out more performance.