Question / Help Why OBS Classic is lighter than Studio?

Is it normal for OBS Classic to be much lighter at CPU usage than Studio? I'm streaming with two PCs, capturing the gaming PC through RTMP server (gaming PC runs OBS Studio with all the scenes and streams to rtmp with NVENC).

I tested some softwares for the streaming PC: OBS Studio, Xsplit, Elgato Game Capture and OBS Classic.

OBS Classic turned out to be the lightest and most efficient, I was able to stream 1080p60 with x264 Medium smoothly and the CPU usage was 50-70% (total PC usage, not just OBS)

OBS Studio on the other hand frequently reached 95% at the same settings, even with just one scene (the rtmp video).
Am I missing something? I'm sorry not being able to include a log file here, can't right now.
 
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