A hands-on benchmark comparison of Java performance across multiple single-board computers including Orange Pi 5 Ultra, Raspberry Pi 5, Raspberry Pi 4, LattePanda IOTA, and several RISC-V boards. The author built a custom JBang-based benchmark runner using the Renaissance Benchmark Suite, covering seven workloads including actor concurrency, fork/join parallelism, and in-memory databases. Results show the Orange Pi 5 Ultra (ARM RK3588) leads among traditional SBCs, with Raspberry Pi 5 a close second. RISC-V boards (Orange Pi RV2, BeagleV-Fire, StarFive VisionFive 2 Lite) are viable but slower. The benchmark tool and an interactive dashboard are publicly available on GitHub.
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