i got lag scrolling for facebook too after changing to killx 1.2.3 kernel, i know facebook apps suck, but pair with killx kernel was much terrible.
Have you guys tried this? Read this from his original thread FAQ.
Facebook scrolling is TERRI...
I dont know whether to take offence or really think hard on that comment ... but you really are prompting me to come out of hibernation :p
Please come out la.. :P