У вашего броузера проблема в совместимости с HTML5
This is a benchmark of Far Cry Primal at 1920x1080 on PC, it doesn't run too bad but not great either, it seems that the GPU usage gets lower if you run it at a lower resolution so it's not putting out all the frames that it could do, hopefully it's a bug and it'll get patched out.
And since Shadowplay likes to kill performance much more than it used to these days (at least for me), I did a picture comparison of 2 benchmarks with Shadowplay Recording and with Shadowplay Disabled to give you a good idea of what it'll be like without any recording software being on.
PC specs:
Intel i7 4770k@4GHz
MSI GTX970x2 (SLi disabled for single GPU Benchmarks)
Corsair 16GB 1866MHz
Asus Xonar D2X
60GB Corsair Force GT SSD
120GB Corsair Force GT SSD
256GB Corsair Force LX SSD
1TB Western Digital Black
1TB Western Digital Green
Coolermaster V850 PSU
NZXT H440
NZXT Kraken x61
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