Even without your init file (`emacs -Q`)? Or try profiling (M-x profiler-start, pick cpu, do stuff, then M-x profiler-report) to see if any third party package

Even without your init file (`emacs -Q`)? Or try profiling (M-x profiler-start, pick cpu, do stuff, then M-x profiler-report) to see if any third party package is involved or not