Why is my gigabit download speed limited to 360mps?

I've found a dozen articles all over the internet that the issues with my gigabit download being limited to 30%, and they all have one thing in common: Bitdefender. I've replaced every piece of hardware, including the mother board, the hard drive, the processor, the router, the fiber box, and every computer I own and run speed tests are limited to 360mps. Upload speeds are fine, it's downloads only.

I have the tech at my house plug HIS computer into my box without making a single change, and he runs 950+/950+

I've tried all of the various suggested changes to active firewall and such I found relating to Bitddfender, with no help. With COVID and my wife and I both working from home on video calls all day, I can't have the limits. I might not have even noticed it otherwise.

Answers