Question / Help Video is laggy but game is not?!?!?! PLEASE HELP

Hi, I am a new user to OBS, and I am struggling to understand settings in Advanced, Encoding (especially encoding) and video. I am recording Minecraft, and I am getting around 25 to 50 fps (pretty good), and I am not experiencing any major lag. however, when I take a look at the recording I just made, I get a second long screen freeze, every 1.5 seconds?!?!!? Here are my specs:
Intel Core i3 Processor,
Intel HD Graphics,
Windows 8.1,
6G RAM,
750G Hard drive,
25 mbps Download speed,
6 (whatever measurement on speedtest.net) Upload Speed.
I am using a hp Laptop
Here are some pics that show my settings...
Video.PNG
Advanced.PNG
Encoding.PNG
Rec Settings.PNG
 
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