How can you optimize Groovy code performance using static compilation?

Apply @CompileStatic to hot, frequently-executed code paths first - tight loops, methods called in high volume - since that's where the overhead of Groovy's dynamic dispatch, looking up the right method implementation through the metaClass on every call, actually accumulates into a measurable cost.

Where full @CompileStatic isn't practical because some dynamic behavior is genuinely needed, apply @CompileStatic at a finer granularity, on specific methods rather than an entire class, so only the performance-critical parts pay the restriction cost while the rest of the class keeps its dynamic flexibility.

Combine static compilation with avoiding unnecessary GString usage and closure allocation inside hot loops, since both carry their own overhead - GString evaluation, closure object creation - independent of dispatch style, and neither is automatically eliminated just by adding @CompileStatic.

Profile before and after applying static compilation rather than assuming it will help uniformly - some genuinely dynamic patterns, like heavy metaClass-based DSL usage, don't benefit and may even need to stay dynamic, so static compilation is a targeted optimization, not a blanket setting to apply everywhere.