Could R CMD check be using valgrind to run the examples? Valgrind has
to interpret CPU instructions manually to be able to warn about
results of code execution depending on memory values it considers
undefined, so it is much slower than execution on a real CPU.

One way to verify that on a GNU/Linux system would be to temporary
insert system('pstree -aps $$') into one of the examples and look at
the output produced.

Best regards,

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