Question / Help Video occasionally choppy

[Quinzlord]

Ok so at some points in a video my recording will lagg to some extent but on youtube the quality doesnt look like the recording.

 

[Quinzlord]

people usually say to attach the files so i just did it off the start

 

[Quinzlord]

What would you recommend

 

[Quinzlord]

and why would i need to down scale is my pc not strong enough