editing software

So I recently got my hands on Vegas Pro 15.0 because I was curios to see the new NV Encode render mode, and to my surprise, I now render x6 times faster than I do with 14.0. Which is great, worth the investment for what I do, but I have also been struggling with choppy/laggy playback in the...

Id like some help picking some video editing software for YouTube. mainly gameplay stuff. If its free fantastic if not hopefully something to expensive maybe less than £100? and no subscriptions please. Hopefully nothing to complicated but id like it to be able to cover the following things...