Enable UEFI and Disable CSM for optimal post times. My post time is around 8 seconds, windows loads in a further 6 seconds for a total boot time of just under 15 seconds from switched off. Cold boot takes longer due to memory training, just don't switch off or unplug your psu.
Post times are much longer with CSM enabled and/or UEFI disabled on both my boards (MSI B450i and Gigabyte X570i), around 20 seconds to clear post. If you combine that with a cold start (power off at wall) it takes around 45 seconds just to clear post. Secure boot mode might increase post time too, I don't use it and haven't tested.
Referencing the two codes a few posts above, 02 is early bios initialisation (UEFI/Legacy), 92 is CSM/UEFI loading drivers. The 92 pause is most likely caused by CSM being enabled, but could also be down to a bad/old UEFI firmware on an add in card. Some Nvidia Maxwell cards had firmware updates to specifically address this issue many years ago (my reference Palit 970 cards were affected), they used to hang on 92 for ages with CSM enabled.