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They certainly haven’t gone too fast they should have been at Kyiv within a day.
Russian doctrine is to keep advancing, as the point units are worn down for one reason or another they are replaced by fresh units rather than resupplied.
150,000 troops was unlikely to be enough, you are supposed to have a 3:1 ratio to attack. Perhaps Putin just didn’t have enough well equipped loyal troops, perhaps he just got it badly wrong
BBC reporting that the Russians are running out of fuel for tanks. Normally a sign you have gone too quickly and left your logistics behind or you didn’t allocate enough in the first place.