A bench of Justices G S Sistani and Chander Shekhar said the police had collected evidence in the matter in February 2015, but was yet get the final result of the electronic evidence they seized in the case including that of the close friends of Tharoor and Pushkar.
"This (collection of evidence) is something that happened in February 2015. Why has the police not been able to get the final result even after two years," the bench asked.
"We are also concerned as to who is the real culprit," it said.
"Here is somebody who passed away back in 2014 and you (police) initially said it was a case of suicide, but later it turned out to be one of homicide," the bench said.
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Tharoor's stepson Shiv Menon has sought his impleadment as a party in the matter after Swamy moved the court seeking a probe.
Objecting to the locus issue of the petitioner raised by Menon's counsel, Swamy said, "There is no lack when it comes to publicity and I am a national-level politician."
He said he was only trying to stop the police from covering up the investigation in the case.
Swamy alleged that Pushkar's son is not at all interested in knowing the reason behind the death of his mother and is only interested in her property in Canada.
The BJP leader said that he could show a letter which "proved" that Menon was "concerned" about his mother's property.
Advocate Pahwa, however, submitted, "I (Menon) do not think anybody else will be more concerned about my mother's death.
"I have not given any authority to anyone to file any petition on my behalf," his counsel said, adding that a prayer has been made for a direction to the police to conclude the probe and submit the final report in the case.
It said the petitions filed in matter were aimed at putting pressure on the police as they have not done anything in the last three-and-a-half years.
The bench also asked advocate Divakar, representing the Delhi Police, as to whether he was satisfied with the status report filed in the case.
He replied that the prosecution was "satisfied" with the investigation as of now and was trying to get more information.
The bench, however, was not convinced with the police' submission with regard to the difference of opinion in the findings of the Central Forensic Science Laboratory (CFSL) and the Forensic Science Laboratory (FSL), both based here.
The police, meanwhile, said that approvals for sending these devices to their manufacturers abroad for chip-level retrieval are being obtained from the competent authorities.
The court, however, directed the police to file an additional affidavit with regard to the probe into the matter and listed it for further hearing on August 30.
Swami has moved a fresh application seeking a copy of the charge sheet to be filed by the city police in the matter within 45 days.
Earlier, the bench had expressed displeasure over the failure of the police to file a charge sheet in the case.
Pushkar was found dead under mysterious circumstances in a suite of a five-star hotel in south Delhi on the night of January 17, 2014.
Swamy, along with advocate Ishkaran Singh Bhandari in their plea, has alleged that "inordinate delay" has been caused in the investigation "which is a blot on the justice system".
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