11. The system of claim 8 , wherein the values and parameters comprise at least one of computational costs and frequency of occurrence.
8. A system comprising: a processor; and a non-transitory computer-readable memory having stored therein instructions which, when executed by the processor, cause the processor to perform a method comprising: extracting, at a first time a plurality of phoneme sequences from a text corpus, where a phoneme sequence within the plurality of phoneme sequences occurs more than once within the text corpus; identifying joins calculated to synthesize the phoneme sequence to yield identified joins; storing the identified joins in a cache for use in speech synthesis at a second time that is later than the first time; and performing speech synthesis using the identified joins.