Default orginal vs 2104 for lecture notes

I recently got original note 10.1 which I use exculsively for taking/recording ntoes in class using lecture notes app and I use the app to do homework, read textbooks, annotate pdfs etc.
This has been my only use case for the tablet. I never watch movies, check facebook or do anything else. I may listen spotify once in a while but thats about it.
I've noticed that lecturenotes is sluggish on big pdfs. I was wondering if 2014 edtion would be a good upgrade for me. Would it be better for reading pdfs ( my main use case) from better screen resolution. Would the faster processor make noticeable difference in sluggishness of lecturenotes ?