Lightbulb bug detected when wireless activated

today I was watching videos on youtube on my Xperia X8, with both wifi and bluetooth enabled, when I noticed that activation is pretty slow when the other one is activated already. The strangelest thing is that I continue with the original rom 2.1 updated (yes still), when this is supposed to have no bug. Is it normal o unusual? If so, which is the fix? Well, here is the challenge.