Whats the best Modern Day Performance mod for an older Laptop?

I Repaired my first ever Laptop with which I used to play 1.7.10 on back in the day. While that version still runs at a buttery smooth 60 fps, trying the newest version barely manages 15 fps, if even that.

Since the days of Optifine, I've heard that there has been a bit of a Performance mod war going on, but since im out of the loop, I've wanted to ask whats the best performance mod for the job?