Huge FPS drop using one of the languages with other font on debug screen

At the moment I am using pirate speak as the default text is buggy for resource packs. Upon pressing F3, my FPS would drop from the usual ~80-100 to ~20-30. Checking it with any of the normal fonts has no such issue.

To reproduce:
-Change to a language with the different font (e.g Pirate Speak)
-Press F3
-Observe the FPS drop.