Disable Psychovisual Tuning. It's currently on. It, along with Lookahead and the Max Quality preset, can cause massive amounts of rendering and encoding lag even on systems that should not otherwise experience them.
Use the Quality preset, and make sure both PVT and Lookahead are disabled.
I would also recommend uninstalling the StreamElements OBS.Live plugin. It makes several changes to core OBS Studio files and replaces them with inferior versions, along with (as Lawrence noted) puking all over the log and making it hard to diagnose. All SE OBS.Live functionality can be added to base OBS Studio via Custom Docks.
The big one is to turn OFF Psychovisual Tuning though.