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Significant Internet slowdown after Norton Security install

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Significant Internet slowdown after Norton Security install

A few days ago, I installed Norton Security. At first, I was really impressed by how well the software was design and didn't significantly slowdown my PC. I decided however to check Internet speed and was shocked. My speed decreased well over 50%. My speed before Norton hovered above 1000 Mbps, and after Norton speed dropped to around 400 Mbps but mostly in the range of 350 Mbps. This is a huge decrease. Immediately I uninstalled Norton Security, check the speed again and saw again speeds over 1000 Mbps. I would like to have Norton Security on my system, but only if I could disable any setting that causes the slowdown. Any ideas?