As nouns the difference between optimiser and optimizer
is that optimiser is an alternative spelling of lang=en while optimizer is a person in a large business whose task is to maximize profits and make the business more efficient.
optimizer
English
Noun
(
en noun)
A person in a large business whose task is to maximize profits and make the business more efficient
(computing) A program that uses linear programming to optimize a process
(computing) A compiler or assembler that produces optimized code