Angry about information speed (5)
I believe the answer is:
irate
'angry' is the definition.
(irate can mean angry or annoyed)
'information speed' is the wordplay.
'information' becomes 'i' (common abbreviation for information).
'speed' becomes 'rate' (both can mean pace).
'i'+'rate'='IRATE'
'about' acts as a link.
(Other definitions for irate that I've seen before include "Livid" , "having got in wax" , "Angry and incensed" , "Boiling" , "Full of 22" .)