MP4 video editor recommendations ?

think i tried the trial version first. don't remember for sure, think that was limited in how large of file i could import. worked well enough for me to decide i liked it. i had tried a few other "free" ones first and liked this the best for the $$. i normally don't mind spending other peoples $$ but other than win7 how built is you comp? i started it on win10 with an i3 core and 16 gig ram and once the length got over ~15 min it would bog down pretty good. i changed to an i5 core and no issues now