make tooling generate jobs with high core count by default
when migrating to future series jobs don't have performance metrics yet so the automatic core assingment defaults to core2 which means the first N builds are going to be dreadfully slow! when performance metrics can't be generated we should likely assume 4core or maybe even 8core. it's better to have too big a machine and downscale the job over time than to have too small a machine and have the jobs be dreadfully slow until they get upscaled.