Unfortunately, while the justice system is mostly fact-based and thus a place where Trump doesn't usually fare well, it is quite slow and always has been. The reasons for that have been discussed.
The January 6 case was always fraught with the immunity question, which in all likelihood, even without a kangaroo SCOTUS, would have required appeal, remand for further proceedings and another appeal. And, of all the cases, it is the most charged with "weaponization," see the hundreds of convictions of 1/6 rioters, to this day dismissed as political.
The one case I think where Trump might have suffered by a jury trial was the Mar-A-Lago documents case. But no one can really say that indictment there was delayed or sandbagged. Without substantial immunity questions, it might, maybe have been tried before the election had it been assigned to a Chutkan or Middlebrooks-type judge and not Aileen Cannon. But the base still steadfastly refuses to acknowledge any difference between that case and the classified documents "cases" against Biden and Pence.