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Project Leyden aims to improve the startup time, warmup time, and footprint of Java applications. The best way to improve these metrics is to identify computation that we can simply eliminate. Failing that, we can shift computation temporally, later or earlier in time. We can shift it to a point later in run time, in the hope that it won’t always be necessary but, if it is necessary, at least moving it out of the startup and warmup phases. We can also shift computation to a point earlier than run time, such as compile time, thereby also moving it out of the startup and warmup phases. We’ll dive into what all this means, how it could work, and review recent progress.