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SCTP uses 32 bit checksums rather than 16. It may be the case that your hardware can do 16 bit checksums in hardware, but for SCTP it has to do the checksum in software. (I think it used to be the case and maybe still is that SCTP vs TCP benchmarks would disable hardware checksums so that the results weren't biased unfairly in favor of TCP.)

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Some Intel NICs (at least the 10G ones, but some Googling suggests some 1G as well) support SCTP checksum offload. Also, the checksum is a CRC32C and the SSE4.2 CRC32 instruction can calculate these really fast.

even at gigabit speeds, unless the implementation is really, really bad, checksumming will absolutely not be the issue here as far as my experience goes.

Benchmarks should be consulted before preformance issues are debated.

I once made a CRC64 implementation, and single core performance was at 1150 MBytes/s on Java 8. So, yeah.

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