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ServerLevel#getWorldBorder()callsSavedDataStorage#computeIfAbsenton every call, and our thread-safe version of that usesConcurrentHashMap#compute.computetakes the bin lock even when the value is already there, so region threads end up contending on it whenever they touch the world border.This checks the cache with a plain
getfirst and only falls back tocompute/computeIfAbsenton a miss. Same idea as the get-before-computeIfAbsent inSynchronousPluginExecution../gradlew :shreddedpaper-server:compileJava)