That's a matter of opinion. My choice would be Pitman Shorterhand.
The most efficient way to learn a new language is through consistent practice, immersion in the language, using language learning apps or courses, practicing with native speakers, and setting specific language learning goals.
The Korean written language is called Hangul. It was created by King Sejong the Great in the 15th century to promote literacy among the Korean population. Hangul is known for its scientific design and efficient phonetic system.
Seeming as its British it would be English, unless of coarse you are in Wales then it would be written in welsh.
The language in which the document was first written is not specified in the question.
At first blush one might think Chinese, because of their population. But for a written language to be understood, the peoples must first be literate - ie they can read and write. So perhaps written English would claim that palm, though Spanish and Portuguese would not be far behind.
The most efficient way to learn a new language is through consistent practice, immersion in the language, using language learning apps or courses, practicing with native speakers, and setting specific language learning goals.
The Comanche, like most native Americans, had no written language of their own.
Anton Kruger has written: 'Efficient FORTRAN programing' -- subject(s): FORTRAN (Computer program language)
The most efficient way to store a list is with an array.
Latin
They most likely did not possess written language for most of their existence. They may have used the devanagari script in later years.
The major written language of Ghana is English. Only the larger indigenous language groups are sometimes written, including Akan. Most of the languages do not appear in written form.
C language is better for hardware programming .Most of the programming for hardware are written in C language so it is beneficial for hardware programming is not efficient for application programming due to drawback like in C data moves around the system.
The original Java compiler was probably written in C/C++ because an efficient language like C is ideal for writing compilers in.
Most plainchant was written in Latin. This language was used in liturgical practices within the Catholic Church, and plainchant served as the musical foundation for these ceremonies.
It is Latin
The superlative of efficient is "most efficient."