Before revision:  We found that strong scaling performance was impeded by stragglers, MPI processes that were slower than the typical process and that therefore dominated the overall run time . Stragglers were less prevalent for compute-bound workloads, thus pointing to file reading as a crucial bottleneck for scaling.
After revision:  We found that strong scaling performance was impeded by stragglers, MPI processes that were slower than the typical process and that therefore dominated the overall run time . Stragglers were less prevalent for compute-bound workloads, thus pointing to file reading as a bottleneck for scaling.