Titan XP is pretty fast. It's not that much slower than the 3070 - I don't think it's the graphics card. https://www.gpucheck.com/compare/nvidia-geforce-rtx-3070-vs-nvidia-titan-xp/ - Also, before anyone comments or makes snide remarks, I was gifted the Titan XP by a friend who was part of the nVidia academic elite (he got several).
That said, I can try other browsers and enable/disable hardware acceleration on both and report back.
Thanks for being an open minded developer and not blaming everything on old computer :)