Hello :)
Emacs 29 RC1 takes around 25ms longer to start without config and about 25ms with config. These timings are the best of 5 runs of emacs-init-time on 29 RC1 and 28.2.
0.595389 seconds (29 RC1 w/ config)
0.222545 seconds (29 RC1 w/o config)
0.556751 seconds (28.2 w/ config)
0.197640 seconds (28.2 w/o config)
Output of report-emacs-bug ran in 29 (w/ config) below: