What's faster iterating throught a list<T> or Ienumerable<T>

[SalahChafai]

is it better to use foreach on a list<T> or an Ienumerable<T>, i have the collection as Ienumerable so to make it a list i'll actually have to convert it, i'll only loop through the collection once so what's faster looping through the Ienumerable as is once or converting it to a list and then looping through it once

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