Does using replacement variables has imapct on performance?

[Chris8]

Does using replacement variables has impact on performance?
Let say I will use in templates in hundreds of places one replacement variable, will it have any impact on performance when compared to using static text?
I'm wondering if I should use replacement variable or to do manual edits for all child styles that will reflect the difference between main and child styles. Both ways seems to be ok, I'm just not sure what would be better for performance. Altering loads of child style templates or using one single replacement variable that will be different for all styles???

Yup, I know I repeat myself, it's just for better understanding.