Any cloud based CI is too slow due to lack of parallelisation
Travis CI, Circle CI, AppVeyor Many configuration pivots:
NTS/ZTS, 64-bit/32-bit, OPcache on/off Changes between PHP patch versions
Line changes for OPcodes, bug fixes in PHP I have a local machine with plenty of cores and memory Nightly builds of PHP 7.4 and 8.0 %https://xdebug.org/ci%