From the discussions I've read, it seems that the Russians went slow at the beginning because they thought that many Ukrainians would support them against the neo-nazi flavoured government, and perhaps bring the government to the negotiating table. But that didn't work out, the Ukrainians didn't in general support them, and the 'West" kyboshed the fruitful negotiations between the Ukraine and Russia.Can we really blame the Russians for going slow with this? I have no doubt that there are voices in Russia willing to go all-in and end this thing by carpet-bombing Kiev, but that would definitely bring chaos that could ultimately also hurt Russia, there are intricate commercial relationships that are complex and hard to balance between Russia and Europe. And something like this could also trigger the panic mode in Europe and seduce them to do even more stupid things, pushed by the US
Yes, there appears to be some segment of the Russian population that would like to end the war quickly through, as you say, carpet bombing Kiev. There are consequences to that sort of action that I think the Russians would not like to deal with, not the least that they are fellow Slavs, and Kiev the first capital of Russia. They're going slow now to keep Russian casualties as low as possible.
I am sure that the commercial relationships you speak of are a factor, plus the perceptions that if Russia did go 'all out' aggressive that would play into the narrative of Russia wanting to attack Europe.