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Did your add other things to the cameras task list? Ie, 24x7 sd recording, video, snapshots, ftp,etc. My 2132l h/w a would lag 1 to 2 seconds with 3 second pre recording for ftp (which is almost 5 seconds! ) when added 24x7 recording to sd card. (I was also wireless at the time).
Also of note, if you are constantly setting off motion detection from sensitivity being too high, this would slow Dien email and may also introduce lag.