If I'm typing text anywhere (browser, app, PB login, etc.) and it is delayed like you describe, that will always quickly lead to the screen freezing up so I restart the PB when it happens. If not and left too long, when it hangs only turning my PB off and then back on will get it going again.
I have never experienced a delay like you have described. is it really more than a few seconds? is it just after you use a memory intensive game or program?
I experience this at times when typing into form inputs.
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I notice it on crackberry when signing in, but usually it only happens when i start typing before page is fully loaded, i guess cause its a flash heavy page..