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I ran RV32 core on FPGA, it was useful but painfully slow.

Does it really have only 32 GPIO? No DMA?

The core provides (depending on configuration) ~0.9 coremarks per MHz.

The base core has 32 GPIOs (32xinput + 32xoutput) and no DMA. If you need a DMA or more GPIOs you can attach them to the Wishbone/Axi interface.