The items that use the most amount of cpu in obs are:
1.) downscale/filter, this is when you are playing a game in 1080p but scale the video down to something smaller in order to match the kbps you're able to put out or plan on using. Anytime you downscale you want a Lanczos filter to keep everything looking the best it can.
2.) FPS, weaker cpu's really have a difficult time running higher fps in both obs and xsplit. All of this work is done on the cpu, unless you specifically set it to use the GPU (gpu rendering is not recommended for most setups and more so with your 950 gpu). Even with an i7, i recommend staying at or under 45fps. fps scales 1:1 with kbps unless you're using pretty heavy cpu presets. This means in order to output the same visual clarity/quality, you'd have to murder people on your stream with 2x the kbps vs 30fps.
3.) x264 CPU Preset (original obs) or Encoder Preset (studio), This is where the quality/filters are applied. The slower the preset, the better the quality but uses a more cpu per tick.
generally when i set up streams i look at the hardware being used, then match it up for the best quality based on cpu and kbps that can/will be used.
For you, i'd simply just kick down from 60fps to 30. None of the past broadcasts on your stream would look much different in fluidity, but visual quality would jump up. You'd likely notice the quality bump a lot more in things like minecraft or any game that is faster paced than city. in short, you'll drop pixelation, and the cpu wouldn't be as taxed.
Personally i stick with the original OBS simply because it's interface/layout is far superior. granted you lose a lot of the new options but for most people, those are features people aren't using anyways.
Additionally chroma key, is WAY better in original. This is about 90% of why i will not stream with studio. Not sure why it's so bad in studio but that really needs addressed.
