The game's optimization of FPS does not seem to be very good

So I made a comparison between the game itself and the fps after adding optifine as shown in the figure, and I found that there was a big gap.In addition, I found that after joining optifine, even the explosion of tnt was a lot easier, but the video size was not allowed, so I I think the gap in the picture should be able to explain the problem and I can see from the picture that I use the configuration of i5 4460 and rx580. But in short, I just hope that you can make better optimization and adjustments to the game's fps.