I'm waiting for Countzero and his amazing lack of paragraphs...
Others on here spell badly and don't use correct punctuation, and you bitch about paragraphs. Pedant.
FWIW, the text lag thing I've noticed since the upgrade,
but, it's only on here, and one other forum; I've not noticed it anywhere else, for some reason. I've not tried other browsers for this site, I'll give it a go with Perfect Browser or one of the others I've got, and see what happens.
Although the lag doesn't seem to be quite so bad at the moment.
Regarding wifi randomly dropping off and going onto 3G, using up data, I had that happen a lot, to the extent I changed my contract on O2 to give me 1Gb of data and less text and minutes, but that was long before the iOS 5 update, and isn't so bad now, but still happens from time to time.
I think it's a lot to do with BT's shonky router and network, personally.