Search Filter: Minimum Characters Typed before it triggers

[Blizz]

Since I'm keeping a very long history for my groups, it usually takes a while to load. When I start typing in the filter and it tries to filter on a single character this is seriously intensive.

So I'd rather be able to set the amount of chars (for example min. 3) to trigger the first search. This could be added as a nerdy tweak and left on default behavior as to not change anything for users not interested in this.