The first recorded spelling of the family name is shown to be that of Lewin Wisman which was dated 1154, in Records of the Abbey of Bury St. Edmunds, Suffolk, during the reign of King Henry 11, known as The Builder of Churches, 1154 - 1189.
Optimization is an act, process, or methodology of making something (as a design, system, or decision) as fully perfect, functional, or effective as possible; specifically : the mathematical procedures (as finding the maximum of a function) involved in this.
Optimising means maxing out or increasing the efficiency or general performance to bring out the best in something. As for graphics it means that an image should balance out the best quality with a decent and reasonable file size.