Hi,
There is a heuristic (same for SonarQube and SonarCloud) based on the number of files to blame and the number of available CPUs to decide whether to use our JGit extension (able to blame multiple files in a single call) or the native git CLI to blame files individually.
It seems in your case the choice was made to favor the single-blame option.
You can influence this decision by setting the scanner property: sonar.scm.use.blame.algorithm=GIT_FILES_BLAME