Personaly i find that capital punishment right off the bat is too fast, some of the people that commited murder can repent, and there are also innocent people that were wrongfully convicted. Which is why i say there should be a period of 5 to 10 years before taking the decision of giving the death sentence. The prisoners would have to go to the court, or see a proffessional to know if he can repent or not. If he doesn't show the will to repent, he gets executed.
You say that this would take time and money? agreed, but do you know how much it costs for a prisoner to be kept in jail? over a hundred thousand bucks per year, per prisonner.
So after that 5-10 year period, the person goes to court, then he is either executed, which will end the fees for keeping him over the years. If the person can repent, that person will just remain a dozen more years in jail and will be able to go out afterward.
Time and money has been saved.
Of course the most money and time saving solution is to send every murderer to the chair, but that would mean that you'll kill innocent people and people with the will to repent too.