I think it's probably circumstantial and dependent on lines and breeding etc.
Having said that, Shayna, who is Albino and Spider, shows almost zero Spider issues.
If 100% is full Spider neurological issues, and 0% is a normal albino, Shayna is probably around 10%.
She eats great, moves great, and has no discernible wobble, 90% of the time, and occasionally, and slightly, if you look for it. If you didn't know what to look for, you would never notice it.