Are you using a built-in video card for your monitor or is it plugged into the GPUs? If so plug it into the onboard motherboard DVI connector instead and use onboard video. If you are using the display output from the GPU, then it usually slows down whenever you are browsing the web or playing games. Hence your speed will always be slower.
My work computer has a 1060 6GB graphics card. OS Windows 10. It is always in the mining mode.
I work without problems on a computer, watch movies, YouTube and this does not affect the hashrate. Before that, my computer had RTX 2070, and I even played simple games on it without losing the hashrate. Then I put it on the farm.
AshHertz, which PSU are you using?
That's impossible, you can't mine and play video game on the PC at the same time, it will surely reduce it's hashrate or even stop mining and hang your system, I don't believe this, I can go with youtube video and browsing but not gaming, even watching YouTube video while mining will slow down your hashrate