peak / peek / pique
The top, a glance, and a sting to pride or interest.
A peak is a high point: the peak of the roof. To peek is to glance: peek at the list. To pique is to sting pride or to stir interest: pique her curiosity. Do not write peek performance.
Examples
Use Traffic hit its peak at noon.
Use Peek through the glass.
Use The note piqued him.
Avoid Peek performance