Read accurately, if the 60fps is the 100% that we want to reach, then 30fps is 50% of that goal, meaning that if we increase 30fps again that would be another 50%
the same applies for 23fps to 30fps
how much is 23fps from 30fps(100% we want to reach), then the 7fps that we are missing are the ?% we still have to accomplish to get the 100%(30fps) since the 23fps percentage has already been achieved