Any Benefit from HTTP Scanning in Passive Mode?

I have IMON enabled on my Beta. In that I have HTTP scanning turned on. I tried using my browser set on Maximum Efficiency (active mode), but found that the delay in loading pages, while not intolerable, was irritating. I have since switched the setting back to Maximum Compatibility (passive mode). Am I getting any benefit from HTTP scanning with these settings or should I simply turn off the HTTP scanning.

Thanks in advance

P.S. I use a download manager which must be set for Maximum Compatibility (passive mode).