Blazor: @key attribute in Virtualize component

[Jimmys20]

Hi, I'm trying to figure out if I should use @key attribute in my Blazor WASM app. In my scenario I use Virtualize component to display customer search results. All results are loaded at once. I'm using Virtualize so that only the results that are currently visible to the user are rendered. The list of items only changes when a new search query is submitted and the list now references the new results. Each row displays customer details like photo, first name, last name, etc. So far I'm not using @key attribute and haven't noticed any problems. I'm wondering if I should use it.

Will using @key give any benefits in this scenario?
Is using @key attribute with Virtualize component always a good idea?
How can I measure if @key attribute causes an improvement or not in my app?