If your code runs on old 8086 it's fast enough...

[daydreamer]

...its success, but if you need 4.9ghz you failed miserable 
For Windows code if it works on. 386 success 
For d3d /opengl code,if it runs on worst eldest gpu / software emulation it's success..., but if it needs latest highend gpu you failed miserable   

If you manage to make 1k,4k,64k demo with graphics and sound success,but need to load gigabytes bloat you failed 
Or you disagree???