Thank you! When you say GPU with a recent video encoder, do you mean them separately (i.e. don't use software/cpu streaming; and use an efficient encoder), or do you mean use a GPU that supports recent encoders? I'm afraid my Intel HD 520 isn't particularly new and likely doesn't support modern encoders.
A GPU with a dedicated encoder for x264 or preferably x265/AV1. You can do without it, but you'll spend a core or two on software encoding and the overhead will add a few tens of ms of lag.
With full hardware capture and encode (default on windows, can require tweaking on Linux ) it's virtually free resource-wise.
