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Developers are interested in improving their website performance. While font files are usually quite small in size – compared to, for example, images – and should only be a minor concern, font users are still tempted to reduce font file sizes to a minimum. There are several ways to save a few extra bytes, like removing glyphs and seemingly irrelevant OpenType features. However, altering font files will almost always violate licence agreements between foundries and users. This presentation will demonstrate why font makers are fussy about allowing users to tamper with their fonts by illustrating the importance of OpenType features for fonts with complex script support.