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A general description is here.
Elapsed-time limits can now be set for the lengthier parts of ‘R CMD
INSTALL’ _via_ an environment variable: see its help page. [This is
currently experimental and subject to change.]
It is now possible to set ‘timeouts’ (elapsed-time limits) for most parts of ‘R CMD check’ _via_ environment variables documented in the ‘R Internals’ manual. [This depends on the experimental ‘timeout’ argument of ‘system2()’ and hence subject to change, as are the names of the environment variables.]
‘readRDS(textConnection(.))’ works again. (PR#17325)