Refresh rate is most noticeable a RR of 60Mhz looks like *bip*. your eyes will not like it,but 60fps is ok. But fps in games are not just eye candy,it has impact on gameplay.25fps is not a playable speed it may fool you eyes in movies but it will not do in games.
In linguistics and grammar, a pronoun (abbreviated PRO) is a word that substitutes for a noun or noun phrase. It is a particular case of a pro-form.
The use of the pronoun, the disuse of the grammar pulled him up short. The antecedent of a pronoun is the noun which goes before it, and for which the pronoun stands. He whispered the pronoun so softly that it sounded like a sigh. In grammar it is a pronoun of the first person and singular number.