Intrusion Prevention halving my internet speed
So, for some reason Intrusion Prevention is cutting my internet speed in half. I go to speedtest.net and run a test and get 200-250 mbps. I disable Intrusion Prevention and it jumps to 480mbps. I've tested every other factor and the only thing affecting the download speed is this one setting. I disable it and my download speed doubles.
Any ideas why this is happening? How I can address it?