9. The system of claim 7 , the system further comprising: a fourth module configured to build a plurality of caches of different sizes based on values or parameters.
7. A system for performing speech synthesis, the system comprising: a first module configured to obtain at a first time a plurality of phoneme sequences by applying a first part of a speech synthesizer to a text corpus to yield an obtained plurality of phoneme sequences, the first part of the speech synthesizer only identifying possible phoneme sequences to be used in synthesizing speech at a second time which is later than the first time; a second module configured, for each respective phoneme sequence of the obtained plurality of phoneme sequences, to identify joins that would be calculated to synthesize the respective phoneme sequence; and a third module configured to add the identified joins to a cache for use in speech synthesis.