What's the plural form of peephole optimization? Here's the word you're looking for.
Answer
The noun peephole optimization can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be peephole optimization.
However, in more specific contexts, the plural form can also be peephole optimizations e.g. in reference to various types of peephole optimizations
or a collection of peephole optimizations.