DropDown Filter not filtering correctly

Hello,

I am using a Dropdown and I am experiencing some problems with filtering. Luckily the problems I am experiencing, also happens on Radzen website components.

First, the Dropdown reacts two fast to what I am writing, and sometimes it's adding and deleting letters, even after I finish typping.

Second, the filter is not working properly:

So, when I write 3 letters, it filters correctly (Image):

But if I put one more letter, a result disapears, even if it shouldn't:

That demo searches by CustomerID property which is why it doesn't show Alfreds when you type alfr. We will change the implementation to avoid confusion. You can control the filtering timeout via the FilterDelay option.

Ok, I understand now!
Thank you

By the way, what is the FilterDelay measure? second? milisecond?