Well, you are in the minority then. Just about nobody on the "right" was complaining about it then.
I was whining because it took so long.
It took so long because there was nothing to find. Starr was determined to keep digging until he found something, anything, and he finally settled into bullying women to accuse Clinton of sexual wrongdoing. The latest interview shows that after meeting with Starr, Lewinsky contemplated suicide. Anita Broaddrick so was terrorized she withdrew her voluntariliy given to the effect that Bill Clinton did not rape her, and has been claiming he did ever since. That's because Ken Starr told her if she didn't, he'd charge her with perjury and throw her in jail.
Mueller's investigation is moving at a lightning pace. Over 100 charges, 6 guilty pleas and/or convictions, and over $38 million dollars seized in the proceeds of crime, thus the investigation has paid for itself for a two year run, unlike the Starr investigation which cost the taxpayers over $100 million dollars.
With Mueller running the most airtight investigation in my lifetime, and the most efficient and effective Special Prosecutor's office in the history of the Republic, the ONLY reason that Republicans can have to fear about the Mueller Investigation is that it's doing too good a job and it's unhinging the President who is now publically obstructing justice in a way that makes it difficult NOT to impeach his sorry ass.
And why is that? We didn't see Bill Clinton behaving like a petulant child and fuming around the White House, raging at his subordinates and firing people because the Starr Investigation had him so rattled. Or Ronald Reagan calling the Iran-Contra Investigation a "witch hunt" even as associate after associate went to jail. The only President who's behaviour has matched Trump's as the investigation continued, was Richard Nixon. The guy who was guilty as hell.
The ONLY reason that right wingers are complaining about the Mueller Investigation at this point is because it's been too damn effective. And if Trump continues to behave in this unhinged and deranged manner, and continues to openly try to obstruct and force an end to the investigation, just like happened with Nixon, the Republican Party will have no choice to back his impeachment.