Notably, some employees were perturbed when Raghavan addressed employees at an all-hands meeting in April, when he urged them to move faster, according to several people who spoke with CNBC. Raghavan noted that the staffers working to fix the failed Imagen 2 tool had increased their workloads from 100 hours a week to 120 hours to correct it in a timely manner.

Pichai has made efforts to get Google back to its nimble startup-like culture.